Operation, Maintenance Manual, and Logbook for Propeller Systems HM-5V1-B1000-A, HM-6V1-A1000-A (2018) - page 4

 

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Operation, Maintenance Manual, and Logbook for Propeller Systems HM-5V1-B1000-A, HM-6V1-A1000-A (2018) - page 4

 

 



Page 6-10 

Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

B.  Composite Blade Inspection Requirements

CAUTION: 

MAINTAINING A GOOD LOGBOOK RECORD IS PARTICULARLY 

IMPORTANT FOR COMPOSITE PROPELLER BLADES. DAMAGE 

AND/OR REPAIRS MAY SUFFER FURTHER DEGRADATION 

AFTER CONTINUED USE. SUCH DEGRADATION MAY BE EASILY 

OVERLOOKED. IT IS IMPORTANT FOR INSPECTORS TO HAVE 

ACCESS TO ACCURATE HISTORICAL DATA WHEN PERFORMING 

SUBSEQUENT INSPECTIONS.

(1)  Required Record-Keeping

(a)  Composite blade damage and a description of its repair must be recorded 

in the composite blade logbook.

(2)  Maintenance Inspections

(a)  Inspection procedures must be performed in accordance with this manual. 
(b)  Review the blade logbook records and carefully inspect areas of damage 

and previously repaired areas for growth.

If the damaged areas have grown larger, estimate if they will be 

greater than the damage limits before the next overhaul. 

If this is the case, make arrangements to repair the damage at the 

earliest practical time to prevent further damage to the blade.

(c)  Defects or damage discovered during scheduled inspections must be 

evaluated in accordance with allowables outlined later in this section, to 

determine if repairs are required before further operation. 

Although repair of “Operable damage” is not essential before further 

operation, such damage should  always be repaired as soon as 

possible, to avoid further degradation. 

In most cases, “Inoperable damage” must be repaired before further 

operation. 

(3)  Record the details of all damage and/or repairs in the propeller logbook.

Page 6-11 

 Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

C.  Coin-Tap Inspection

CAUTION: 

INSTRUCTIONS AND PROCEDURES IN THIS SECTION 

INVOLVE PROPELLER CRITICAL PARTS. REFER TO THE 

INTRODUCTION CHAPTER OF THIS MANUAL FOR INFORMATION 

ABOUT PROPELLER CRITICAL PARTS. REFER TO THE 

ILLUSTRATED PARTS LIST CHAPTER OF THIS MANUAL FOR THE 

IDENTIFICATION OF SPECIFIC PROPELLER CRITICAL PARTS.

(1)  Composite blades are inspected for delaminations and debonds by tapping the 

blade with a washer-shaped metal tapper or "coin". Refer to Figure 6-3.

(2)  Using a washer-shaped metal tapper, approximately 2.5 inches (64 mm)  

OD x 1.25 inches (32 mm) ID x 0.25 inch (6.4 mm) thick, and weighing no less 

than 3 oz. (85.05 g), tap the entire surface of the blade. If an  audible change is 

apparent, sounding hollow or dead, a debond or delamination is likely.

(3)  “Mapping” of the area to be coin-tapped is desirable to make sure that the 

entire surface is sufficiently inspected. 

(a)  During scheduled Hovercraft inspections, make a coin-tap inspection 

within an imaginary grid or matrix consisting of 2.0 inch (51 mm) squares. 

(b)  A careful coin-tapping of the erosion shield is necessary because of its 

size and shape.

Tap in a smaller grid pattern up and down the length of the erosion 

shield.

Look and feel for a slight deformation of the erosion shield that may 

indicate a debonded area.

If a deformation is found, use more care in that area when doing the 

coin-tap inspection.

(c)  If a suspected delamination or debond is discovered, a localized, careful 

coin-tap inspection is required to define the precise area of delamination 

or debond.

(d)  Using a pencil, outline the suspect area to determine the approximate size 

of the damage.

(4)  If a debond is found, contact the Hartzell Propeller Inc. Product Support 

department.

Page 6-12 

Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

D.  Composite Blade Operable Damage

CAUTION: 

ALTHOUGH A BLADE MAY CONTINUE IN SERVICE WITH 

OPERABLE DAMAGE, THIS TYPE OF DAMAGE

 

SHOULD BE 

MONITORED AND REPAIRED AT THE EARLIEST PRACTICAL 

TIME TO PREVENT FURTHER DAMAGE TO THE BLADE.

(1)  Operable damage is damage that does not exceed the following limits. This 

type of damage will not affect the safety characteristics of the propeller.

NOTE 1

:  Due to the infinite types of damage possible, not all types of damage 

that can be considered operable are covered in this manual. If 

there is any doubt as to operability of the blade, contact the Hartzell 

Propeller Inc. Product Support department.

NOTE 2:  The damage types in this chapter correspond with the numbered 

damage types in the Hartzell Propeller Inc. Composite Blade 

Maintenance Manual 135F (61-13-35), for consistency only. The 

damage types that do not apply to the affected blades in this manual 

have been omitted from this chapter.

Using “Coin-tap” Test to Check for Debond and Delamination 

Figure 6-3

“Coin-tap” along entire surface  

of erosion shield to check for 

debond

APS0325, 0319

“Coin-tap” on composite blade 

surface to check for 

delamination

Page 6-13 

 Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

Interpretation of Erosion Shield Damage 

Figure 6-4

Camber side of blade

Face side of blade

Trailing edge of erosion shield 

on camber side

Center line of leading

 edge of the blade

Trailing edge of erosion 

shield on face side 

Chordwise

Lengthwise

APS6041

When calculating the area of damage and the proximity to other damage, look at the erosion 

shield as a two dimensional shape, as if it were unfolded and spread flat where the face and 

camber sides of the blade could be viewed at the same time. 

Missing Portions of Nickel Erosion Shield (Trail Side) and Typical Cracks 

Figure 6-5

Full width crack

Typical lengthwise crack

Typical chordwise crack

0.25 in. (6.3 mm)

TI-411-006A

Page 6-14 

Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

E.  Composite Blade Operable Damage Limits

(1)  For repair of damage greater than the Operable Damage Limits specified, refer 

to the Hartzell Propeller Inc. Maintenance Manual for Composite Blades 135F 

(61-13-35) or contact Hartzell Propeller Inc. Product Support department.

(2)  Nickel Erosion Shield - Minor Deformation - Damage Type (1) - for the entire 

erosion shield (refer to Figure 6-4)
(a)  Operable Damage Limits:

Deformed material not associated with a crack or missing material 

less than 10 percent of the leading edge radius or no more than 

0.080 inch (2.03 mm) deep that is caused by impact damage or 

erosion is operable.

(3)  Nickel Erosion Shield - Gouge - for the entire erosion shield - Damage Type (2) 

(refer to Figure 6-4)
(a)  Operable Damage Limits:

The maximum permitted total accumulated area of gouges through the 

erosion shield is 0.25 sq. inch (161.2 sq. mm). 

The maximum permitted depth of damage to the blade surface below 

the erosion shield is 0.020 inch (0.50 mm). Exposed foam is not 

permitted. 

This damage cannot be permanently repaired without replacement of 

the erosion shield.

NOTE:  The 0.020 inch (0.50 mm) below the erosion shield is two 

layers of fibrous material.

(4)  Nickel Erosion Shield - Area Missing Along the Trailing Edge of the Erosion 

Shield - for the entire erosion shield - Damage Type (3) (refer to Figure 6-4 and 

Figure 6-5)
(a)  Operable Damage Limits:

Pieces of material from the trailing edge of the erosion shield may be 

missing because of erosion or sanding performed during the erosion 

shield installation procedure. 

The missing area must be no farther than 0.25 inch (6.3 mm) from 

the trailing edge of the erosion shield. Refer to Figure 6-5 for an 

example of permitted missing material. 

This damage cannot be permanently repaired without replacement of 

the erosion shield. 

Page 6-15 

 Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

(5)  Nickel Erosion Shield - Debond - Damage Type (4) (refer to Figure 6-4)

(a)  Operable Damage Limits:

A maximum of 20 percent of the erosion shield may be debonded in 

any 6.0 inch (153 mm) length of the erosion shield.

(6)  Nickel Erosion Shield - Chordwise Crack - Damage Type (5) (refer to Figure 6-4 

and Figure 6-5)
(a)  Operable Damage Limits:

Two full width, chordwise cracks may not be within 6.0 inches  

(153 mm) of each other. 

A chordwise crack may not be within 6.0 inches (153 mm) of the 

blade tip. 

A chordwise crack may not be within 6.0 inches (153 mm) of the 

inboard end of the erosion shield.

(7)  Nickel Erosion Shield - Lengthwise Cracks (refer to Figure 6-4, Figure 6-5, 

Figure 6-6, and Figure 6-7)
(a)  Operable Damage Limits:

The maximum permitted length of a crack is 2.0 inches (50 mm). 

Two lengthwise cracks may not be within the same linear length on the 

erosion shield. 

This includes cracks on opposite sides of the blade. Refer to Figure 6-8 

for an example of violation of this limit.

(8)  Nickel Erosion Shield - Debonds Bounded by a Lengthwise Crack - Damage 

Type (7) (refer to Figure 6-4, Figure 6-5, Figure 6-7, and Figure 6-8)
(a)  Operable Damage Limits:

In the area bounded by a lengthwise crack and the trailing edge 

of the erosion shield, the maximum permitted area that may be 

debonded is 40 percent. 

Refer to Figure 6-7 for an example of a debond that is within the 

permitted limits. 

Refer to Figure 6-8 for an example of a debond that is greater than 

the permitted limits. 

For crack limits, refer to the applicable damage in 4.E.(5) and  

4.E.(6).

Page 6-16 

Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

Acceptable Erosion Shield Debond, Non-acceptable Crack Location 

Figure 6-7

APS6042

Measuring Lengthwise Crack 

Figure 6-6

W10001

Measurement of 

lengthwise crack

"Lengthwise crack" refers only to the length of the crack. To determine the length, 

measure parallel to the pitch axis of the blade from the most inboard location to the 

most outboard location.

NOTE:  The bounded area of a crack extends to both edges of the erosion shield.

FACE 

CAMBER

Bounded area of 

crack

These two cracks are in violation of being within the same linear length. Note that the 

cracks are on opposite sides of the blade 

Area of debond, in the 

bounded area 

that is within maximum 

permitted limits

Page 6-17 

 Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

Debonds in Excess of Serviceable Damage Limits 

Figure 6-8

FACE

Debonds in bounded

area exceed the permitted 

limits

Bounded area 

of crack

CAMBER

APS6043

Debond that does not extend to an 

edge or a crack

Debond that does extend to an 

edge or a crack

Page 6-18 

Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

(9)  Nickel Erosion Shield - Debonds - Damage Type (8) (refer to Figure 6-4)

(a)  Operable Damage Limits:

A maximum of 40 percent of the erosion shield may be debonded in 

any 6.0 inches length (153 mm) section of the erosion shield.

(10)  Nickel Erosion Shield - Debonds Bounded by Two Chordwise Cracks - Damage 

Type (9) (refer to Figure 6-4)
(a)  Operable Damage Limits:

Any number of chordwise cracks are permitted, even full width; but, in 

each area bounded by chordwise cracks the maximum total area of 

debond is 40 percent. 

For crack limits, refer to the applicable damage in 4.E.(5) and  

4.E.(6).

(11)  Gouge or Loss of Composite Material - Outboard Region of the Blade - 

Damage Type (21)
(a)  Operable Damage Limits:

The maximum permitted diameter of the gouge or loss of material is 

0.500 inch (12.70 mm) or an equivalent area of 0.20 sq. inch  

(129 sq. mm). 

The maximum permitted length of damage is 2.5 inches (63 mm). 

Do not include paint when measuring the depth of a gouge or loss of 

composite material. 

The maximum permitted depth of a gouge or loss of composite 

material is 0.020 inch (0.50 mm).

(12)  Gouge or Loss of Composite Material - Inboard Region of the Blade - Damage 

Type (23)
(a)  Operable Damage Limits:

A gouge or loss of composite material on the inboard region of the 

blade is inoperable damage. Refer to Figure 6-9. Repair is required 

before further operation.

(13)  Delamination - Outboard Region of the Blade - for all areas that 

are not

 

covered by erosion screen - Damage Type (24)
(a)  Operable Damage Limits:

The maximum permitted area of delamination is 2.0 square inches 

(1290 sq. mm). 

Page 6-19 

 Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

Repair Regions for Composite Blades 

Figure 6-9

TI-135002

"A"

Distance from the blade 

tip to the inboard  

region of the blade, 

measured along the blade 

pitch axis 

Blade Model

"A"

"B"

"C"

108MH92

33.12 inches 

(841.2 mm)

An Inboard Trailing Edge 

Region has not been 

defined for this blade

33.12 inches 

(841.2 mm)

138MH91

33.12 inches 

(841.2 mm)

An Inboard Trailing Edge 

Region has not been 

defined for this blade

33.12 inches 

(841.2 mm)

Outboard 

Region

 

"C" 

Tip and Trailing Edge 

Region

"B"

Inboard Trailing Edge 

Region 

Inboard 

Region

Page 6-20 

Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

(14)  Delamination - Inboard Region of the Blade - Damage Type (27)

(a)  Operable Damage Limits:

A delamination on the inboard region of the blade is inoperable 

damage. Repair is required before further operation.

(15)  Split Trailing Edge - Tip and Trailing Edge Regions of the Blade - Damage  

Type (28)
(a)  Operable Damage Limits:

The maximum permitted depth of a split area is 0.25 inch (6.3 mm). 

The maximum permitted length of a split area is 2.0 inches (50 mm). 

3

 

Damaged fibers or exposed foam are not permitted. Repair should be 

made as soon as practical to prevent degradation of the condition.

(16)  Split Trailing Edge - Inboard Region of the Blade - Damage Type (29)

(a)  Operable Damage Limits:

A split trailing edge on the inboard region of the blade is inoperable 

damage. Repair is required before further operation.

(17)  Crushed or Cracked Trailing Edge - Inboard Region of the Blade - Damage 

Type 30)
(a)  Operable Damage Limits:

A crushed or cracked trailing edge on the inboard region of the blade 

is inoperable damage. Repair is required before further operation.

(18)  Crushed or Cracked Trailing Edge - Outboard and Tip Regions of the Blade - 

Damage Type (31)
(a)  Operable Damage Limits:

The maximum permitted depth of a crushed or cracked area is  

0.25 inch (6.3 mm). 

The maximum permitted length of a crushed or cracked area is  

2.0 inches (50 mm). 

Damage should be repaired as soon as practical to prevent 

degradation of the condition.

Page 6-21 

 Rev. 1 Sep/13

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

(19)  Paint Erosion - for the entire blade - Damage Type (33)

(a)  Operable Damage Limits:

For areas of the blade where there is composite material, the 

maximum permitted exposure of the composite material and/or of the 

primer filler is 5.0 square inches (3225 sq. mm). 

NOTE:  This limit does not refer to the primer sealer (gray layer).

For areas of the blade where there is an erosion shield, paint 

may be missing from the entire area of the erosion shield and 

the blade is operable.

For maintenance scheduling purposes, propellers with blades 

that show more than 5.0 square inches (3225 sq. mm) of paint 

erosion may continue operation for an additional 250 hours or  

1 (one) month, whichever occurs first.

Refer to Section 5. Painting After Repair of this chapter for blade 

painting procedures.

(20)  Missing Expanded Foil Mesh - Damage Type (35)

(a)  Operable Damage Limits:

The expanded foil mesh may be completely missing, but the 

expanded foil mesh is there to minimize damage from a lightning 

strike. If a blade without expanded foil mesh is struck by lightning, 

damage will be more extensive. Damage should be repaired as soon 

as practical to prevent degradation of the condition.

Page 6-22 

Rev. 3 Apr/17

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

5.  Painting After Repair

CAUTION: 

INSTRUCTIONS AND PROCEDURES IN THIS SECTION MAY 

INVOLVE PROPELLER CRITICAL PARTS. REFER TO THE 

INTRODUCTION CHAPTER OF THIS MANUAL FOR INFORMATION 

ABOUT PROPELLER CRITICAL PARTS. REFER TO THE 

ILLUSTRATED PARTS LIST CHAPTER OF THE APPLICABLE 

OVERHAUL MANUAL(S) FOR THE IDENTIFICATION OF SPECIFIC 

PROPELLER CRITICAL PARTS.

A. General

(1)  Propeller blades are painted with a durable specialized coating that is resistant 

to abrasion. If this coating becomes eroded over an area of more than  

10 square inches (6451.6 square mm), it is necessary to repaint the entire 

blade to provide proper environmental and erosion protection. If the eroded 

area is greater than 10 square inches (6451.6 square mm), contact the Hartzell 

Propeller Inc. Product Support Department.

(2)  For paint erosion over an area of less than 10 square inches  

(6451.6 square mm), aerosol paint can be used to touch-up the blades when 

the paint is applied in accordance with the section, "Painting of Composite 

Blades" in this chapter. 

(3)  Refer to Table 6-1 for paints approved for blade touch-up.
(4)  The paint manufacturers can be contacted via the information below:

 

Tempo Products Co. 

Sherwin Williams Co.

 

 

A Plasti-Kote Company 

Refer to the Sherwin-WIlliams 

 

1000 Lake Road 

Product Finishes Global Finishes 

 

Medina, OH 44256 

Group website at 

 

Tel: 800.321.6300 

http://oem.sherwin-williams.com 

 

Fax: 216.349.4241 

to find the nearest location.

 

 

Cage Code: 07708

Page 6-23 

 Rev. 3 Apr/17

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

B.  Painting of Composite Blades 

WARNING: 

CLEANING AGENTS (ACETONE, #700 LACQUER THINNER, 

AND MEK), ARE FLAMMABLE AND TOXIC TO THE SKIN, EYES 

AND RESPIRATORY TRACT. SKIN AND EYE PROTECTION ARE 

REQUIRED. AVOID PROLONGED CONTACT. USE IN A WELL 

VENTILATED AREA.

CAUTION: 

ANY REFINISHING PROCEDURE CAN ALTER PROPELLER 

BALANCE. PROPELLERS THAT ARE OUT OF BALANCE MAY 

EXPERIENCE EXCESSIVE VIBRATIONS WHILE IN OPERATION.

(1)  Using acetone, #700 lacquer thinner, or MEK, wipe the surface of the blade to 

remove any contaminants.

CAUTION: 

EXCESSIVE SANDING WILL CAUSE "FUZZING" OF THE KEVLAR 

MATERIAL, RESULTING IN A ROUGH FINISH.

(2)  Using 120 to 180 grit sandpaper, sand to feather the existing coatings away 

from the eroded or repaired area.
(a)  Erosion damage is typically very similar on all blades in a propeller 

assembly. If one blade has more extensive damage, e.g., in the tip area, 

sand all the blades in the tip area to replicate the repair of the most 

severely damaged blade tip. This practice is essential in maintaining 

balance after refinishing.

(3)  Using #700 lacquer thinner or MEK, wipe the surface of the blade, and permit 

the solvent to evaporate.

(4)  Apply masking material for the erosion shield.

WARNING: 

FINISH COATINGS ARE FLAMMABLE AND TOXIC TO THE 

SKIN, EYES AND RESPIRATORY TRACT. SKIN AND EYE  

PROTECTION ARE REQUIRED. AVOID PROLONGED 

CONTACT. USE IN A WELL VENTILATED AREA.

CAUTION: 

APPLY FINISH COATING ONLY TO THE DEGREE REQUIRED 

TO UNIFORMLY COVER THE REPAIR/EROSION. AVOID 

EXCESSIVE PAINT BUILDUP ALONG THE TRAILING EDGE 

TO AVOID CHANGING THE BLADE PROFILE AND/OR 

P-STATIC CHARACTERISTICS.

(5)  Apply sufficient finish coating to achieve 2 to 4 mils thickness when dry. 

(a)  Re-coat before 30 minutes, or after 48 hours. 
(b)  If the paint is permitted to dry longer than four (4) hours, it must be lightly 

sanded before another coat is applied.

(6)  Optionally, perform dynamic balancing in accordance with the procedures and 

limitations specified in Section 6. Dynamic Balance of this chapter.

Page 6-24 

Rev. 3 Apr/17

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

6.  Dynamic Balance

A. Overview

NOTE:  Dynamic balance is recommended to reduce vibrations that may be 

caused by a rotating system (propeller and engine) imbalance. Dynamic 

balancing can help prolong the life of the propeller, engine, airframe, and 

avionics.

(1)  Dynamic balance is accomplished by using an accurate means of measuring 

the amount and location of the dynamic imbalance.

(2)  The number of balance weights installed must not be greater than the limits 

specified in this chapter.

(3)  Follow the Hovercraft manufacturer's or the dynamic balance equipment 

manufacturer’s instructions for dynamic balance, in addition to the 

specifications of this section.

NOTE:  Some engine manufacturers' instructions also contain information on 

dynamic balance limits.

Vendor

Color/Type

Vendor 

P/N

Hartzell Propeller Inc. 

P/N

Tempo

Epoxy Black

A-150

A-6741-145-2

Sherwin-Williams

Black

F75KXB9958-4311

A-6741-145-1

Approved Touch-up Paints 

Table 6-1

Page 6-25 

 Rev. 3 Apr/17

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

7.  Tachometer Calibration

WARNING: 

OPERATION WITH AN INACCURATE TACHOMETER CAN CAUSE 

RESTRICTED RPM OPERATION AND DAMAGING HIGH STRESSES. 

PROPELLER LIFE WILL BE SHORTENED AND COULD CAUSE 

CATASTROPHIC FAILURE.

A.  All engine/propeller combinations have operating conditions at which the propeller 

blade stresses begin to reach design limits. 
(1)  In most cases, these conditions occur above the maximum rated RPM of the 

engine. 

(2)  Some engine/propeller combinations have certain ranges of RPM that are less 

than maximum engine speed, where stresses are at a level considered too 

high for continuous operation. This results in a restricted operating range where 

continuous operation is not permitted. A placard on the instrument panel or 

yellow arc on the tachometer will inform the operator to avoid operation in this 

range.

(3)  In other cases, the limiting condition occurs at an RPM only slightly above the 

maximum engine RPM. 

(4)  For these reasons, it is very important to accurately monitor engine speed.

B.  The accuracy of the tachometer is critical to the safe operation of the craft. 

(1)  Some tachometers have been found to be in error by as much as 200 RPM. 
(2)  Operating the craft with an inaccurate tachometer could cause continued 

operation at unacceptably high stresses, including repeatedly exceeding the 

maximum engine RPM. 

(3)  Continuous operation in a restricted RPM range subjects the propeller to 

stresses that are higher than the design limits. 

(4)  Stresses that are higher than the design limits will shorten the life of the 

propeller and could cause a catastrophic failure.

C.  Tachometer Calibration

(1)  Hartzell Propeller Inc. recommends that propeller owners/operators calibrate 

the engine tachometer in accordance with the National Institute of Standards 

and Technology (NIST) or similar national standard (traceable).

(2)  Contact Hartzell Propeller Inc. if it is determined that a propeller was operated 

in a restricted RPM range because of a tachometer error.

Page 6-26 

Rev. 3 Apr/17

 

MAINTENANCE PRACTICES

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

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Page 7-2 

Rev. 1 Sep/13

 

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300

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Page 7-3 

 Rev. 1 Sep/13

 

RECORDS

OPERATION, MAINTENANCE MANUAL, AND LOGBOOK 

300

1.  Introduction

A.  Record every inspection, maintenance action, and repair operation on the applicable 

pages of this chapter. 

B.  All entries must be made in the section of the chapter that corresponds to the 

component being addressed.

C.  The following entries must be completed for the propeller assembly:

(1)  The 

Hovercraft

 manufacturer must record serial numbers and revision letter of 

all new component parts at the time of installation.

(2)  The operator must record serial number, revision letter, and date of all 

replacement components.

(3)  Service History cards must be maintained for the following components:

(a)  Aluminum Hub
(b)  Composite Blades

D.  This Records chapter contains a section for the propeller assembly, including blades. 

(1)  There are individual history cards for each of the major serialized components 

of the propeller. 

(2)  Any maintenance that is performed on a component must be noted on the 

component history card.

E.  If a component is removed and replaced, the component history card must be 

removed from this manual and sent with the component. 
(1)  The component history card of the replacement component must be inserted in 

this manual in the correct location. 

(2)  If a replacement component is installed, note the new component serial number 

on the following page as a quick reference.

2. 

Blade Damage Repair Sheets

NOTE

:  The use of the Blade Damage Repair Sheets in this chapter is at the 

discretion of the user. 

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PROPELLER SYSTEM INSTALLATION HISTORY

PROPELLER MODEL NO:.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PROPELLER S/N:   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLED ON ENGINE SERIAL NO. AND LOCATION

1.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INSTALLED ON HOVERCRAFT MODEL:

1.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OPERATOR

NAME AND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADDRESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NAME AND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADDRESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NAME AND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADDRESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NAME AND  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADDRESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  

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New/Date

Replaced/Date

Replaced/Date

PROPELLER ASSEMBLY COMPONENT CONTROL CARD

Propeller Model No. _______________   Propeller Serial No. ____________________

Blade Design

 ____________________  

Hub Part No.

Hub Serial No.

Fork Part No.

Fork Serial No.

Blade No. 1 Serial No.

P/C/Knob Dash No./Serial No.

Blade No. 2 Serial No.

P/C/Knob Dash No./Serial No.

Blade No. 3 Serial No.

P/C/Knob Dash No./Serial No.

Blade No. 4 Serial No.

P/C/Knob Dash No./Serial No.

Blade No. 5 Serial No.

P/C/Knob Dash No./Serial No.

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RECORD OF SERVICE BULLETIN OR SERVICE LETTER COMPLIANCE

DATE

TSN

TSO

SERVICE BULLETIN OR SERVICE LETTER

SIGNATURE 

(CERT. NO.)

CSN

CSO

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RECORD OF INSPECTIONS, REPAIRS, AND ADJUSTMENTS

DATE

TSN

TSO

DESCRIPTION OF INSPECTION REPAIR 

 

OR ADJUSTMENT

SIGNATURE 

(CERT. NO.)

CSN

CSO

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RECORD OF INSPECTIONS, REPAIRS, AND ADJUSTMENTS

DATE

TSN

TSO

DESCRIPTION OF INSPECTION REPAIR 

 

OR ADJUSTMENT

SIGNATURE 

(CERT. NO.)

CSN

CSO

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ALUMINUM HUB SERVICE HISTORY

HUB PART NO.:

HUB SERIAL NO.:

DATE NEW

INSPECTION

PROPELLER MODEL

PROPELLER SERIAL NUMBER
VISUAL INSPECTION

DYE PENETRANT
ANODIZE

SHOT PEEN

HELI-COILS REPLACED
RETENTION RADIUS REWORK

PAINT

BUSHINGS REPLACED
IN ACCORDANCE WITH MANUAL 

NO.

TSN
CSN
TSO
CSO
INSPECTOR

DATE

THIS CARD IS TO ACCOMPANY THE HUB THROUGHOUT ITS SERVICE LIFE AND SHOULD REMAIN WITH THE HUB DURING OVERHAUL, REPAIR, OR WARRANTY 

CLAIM. 

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COMPOSITE BLADE SERVICE HISTORY

BLADE DESIGN:

BLADE SERIAL NO.:

DATE NEW

INSPECTION

NEW

O/H REP

O/H REP

O/H REP

PROPELLER MODEL

PROPELLER SERIAL NUMBER

BLADE POSITION
MAJOR REPAIRS
LEAD EDGE REPLACED

COIN TAP
RETENTION BEARING RACES

WIDTH
THICKNESS

FACE ALIGNMENT
TSN
CSN
TSO
CSO
INSPECTOR

DATE

SEVICE BULLETIN NO.:

METHOD OF COMPLIANCE

RECURS AT (date/hours)

THIS CARD IS TO ACCOMPANY THE HUB THROUGHOUT ITS SERVICE LIFE AND SHOULD REMAIN WITH THE HUB DURING OVERHAUL, REPAIR, OR WARRANTY 

CLAIM. 

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Record

 of

 Repairs

 for

 Damage

 to

 108MH92

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

30

0

1

8

18

24

42

37.9
36

51.125

48

12

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0

1

8

18

24

42

37.9
36

51.125

48

12

Record

 of

 Repairs

 for

 Damage

 to

 108MH92

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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0

1

8

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24

42

37.9
36

51.125

48

12

Record

 of

 Repairs

 for

 Damage

 to

 108MH92

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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0

1

8

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24

42

37.9
36

51.125

48

12

Record

 of

 Repairs

 for

 Damage

 to

 108MH92

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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42

37.9
36

51.125

48

12

Record

 of

 Repairs

 for

 Damage

 to

 108MH92

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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63.125

60

12

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42

48

54

0

1

8

Record

 of

 Repairs

 for

 Damage

 to

 138MH91

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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54

0

1

8

Record

 of

 Repairs

 for

 Damage

 to

 138MH91

 Composite

 Blade

 - 

Blade

 Propeller

 

Blade Serial No._____________________

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8

Record

 of

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 to

 138MH91

 Composite

 Blade

 - 

Blade

 Propeller

 

Blade Serial No._____________________

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8

Record

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 to

 138MH91

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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8

Record

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 to

 138MH91

 Composite

 Blade

 - 

Blade

 Propeller

Blade Serial No._____________________

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1

8

Record

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 to

 138MH91

 Composite

 Blade

 - 

Blade

 Propeller

 

Blade Serial No._____________________

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