# MAINTENANCE MANUAL GAZELLE HELICOPTER TOME 1 Although the mention "SA 341" appears on top of some pages, this manual is effective for the whole family of 

### "GAZELLE" helicopters SA 341 SA 342, 

### etc..... NOTE 

### The effectivity of this manual depends on the care exercised in bringing it up to date. The signature of the responsible person on page 00.2 guarantees that the amendment has been incorporated. The contents of the entire manual at the latest amendment is given on page 00.3. EUROCOPTER 

### DirectionTechnique

### Support AeroportInternationaldeMarseflleProvence 13725MarignaneCedex-France

## c.s.s. Page Date 65.12.P3 1 08.86 2 08.04 65.12 1 06.91 2 08.91 3 08.03 4 08.03 5 08.91 6 08.91 

### 7 08.91 B 08.91 9 08.91 10 08.03 11 08.03 12 08.03 13 08.91 401 1/2 04.73 2 05.71 402 

### 1/11 08.01 2 08.01 

### 3 08.00 4 08.96 

### * 5 08.07 6 08.03 

### * 7 08.07 8 10.95 9 10.95 10 10.95 11 10.95 403 1/3 08.00 2 08.00 3 08.00 404 1/3 04.73 2 03.80 3 04.73 405 

### 1/2 08.03 2 

### 08.03
NOTE : 

### The asterisk 

### * 

## -- amendment. 08-08 eurocopter 

### GAZELLE HELICOPTER MAINTENANCE MANUAL LIST OF EFFECTIVE PAGES 

## c.s.s. Page Date 406 1/2 07.81 2 07.81 407 1/2 04.73 2 11.78 501 

### 1/2 02.76 2 02.76 502 1/7 12.88 2 12.88 3 12.88 4 12.88 5 12.88 6 12.88 7 12.88 601 1/7 08.01 1M 08.03 2 08.96 3 08.98 4 02.84 5 02.84 6 07.81 7 08.86 7M 08.86 602 1/2 05.71 2 05.71 603 1/6 08.00 2 08.00 

### 3 12.88 4 12.88 5 12.88 6 12.88 604 1/3 12.88 2 08.86 

### 3 10.76 

## c.s.s. Page 605 1/2 2 606 1/2 2 607 

## * 1/3 

### * 2 

## * 3 608 1/1 609 

### * 1/3 

## * 2

3 610 1/1 801 1/3 2 3 802 1/3 2 3 901 1/2 2 902 1/2 2



### indicates the pages affected by the Date 10.76 10.76 08.96 10.76 08.08 08.08 08.08 08.98 08.08 08.08 12.88 08.99 08.99 08.99 08.98 08.06 08.06 08.06 10.94 10.94 08.86 06.74



### latest 65.P2 

### Page3

### Paragraphs 0 - GENERAL 

## aerospatlale GAZELLE HELICOPTER 

### MAINTENANCE MANUAL

**6~.12** 

## MAIN ROTOR HEAD CONTENTS
A- List of equip•ant ••.••.•.....;.......................... 1 B - Data , ........................., . ••. . .••••.••••. . •••.••.. . . 1 

### l - DESCRIPTION - OPERATION A- Main rotor shaft and 

### head assembly •••••······••••••••••• 2 1. Head and shaft asaa•bly ••••••••••••••••••••••••••••• 2 

### 2. Spindles and flapping hinges •••••••••••••·•••••••••• J .J• 

### Sleeves •.....•.•..,.....,......•...........".•..,.. . 4 

# 4. rlared housing...................................... 4 s. Swashplates ...........................,•.. . . ..•. . . . . . . . • 

### 6. Fixed 

### and rotating scissors •••.••••••••••••••••••••• 

### S 7. Pitch 

### control rod ••••••••••····•·••••••••••••••••••· 

## s 8, 

### Coning 

### stop and droop restrainer •••••••••••••••••••• 6 

### 9. Dynamic adapter with integrated damping............. 6 

### 10. Balancing devices................................... 

## & B- Main rotor geometry •••••••••••••••••••·•·•••••·········· 8 

### REMOVAL - INSTALLATION -Installing the 

### swahplate locking tool ••••••••••••••••••••• 401 -Removal- 

### Installation of a rotor shaft assembly •••••••••• 402 -Removal- Installation 

### of a pitch control rod............. 

### 40J -Removal- 

### Installation of 

### scissors ••••·····••••••••••••••• 404 

### -Removal- Installation of oil 

### reservoir ·········•·•••••••• 405 

### -Removal- Installation of a dynamic adapter ,.............. 406

- Removal - Installation of a droop restrainer ring support • 407 

### ADlUSTH£NT - T£STS -Pre-tracking adjustaent on aircraft ••••••••••••••••••••••• SOl 

### -Individual balancing of 

### HRH-Blades assembly ••••••••••••••• 502

6,5.l2.P3 

### 08.1,86 

### Page 1

### Paragraphs INSPECTION - CHECK eurocopter 

### GAZELLEHELICOPTER MAINTENANCE MANUAL 

### 65.12 {Cont'd) 

### MAIN ROTOR 

### HEAD CONTENTS

- Checking the rotor head/sh;;tft assembly •.o o o o o o•••••••••••••••• 

### 601 -Inspection and cleaning the rotor shaft oil jet••••.•.••••••••602

- Checking the pre-tracking on aircraft •...••••••.•••••••.••.•••603

- Flushing the rotor shaft lubrication system (after

contamination) and actions to be taken ••.••.•.•.••••••••••••.•604 

### -Check of the trunnions securing the links to the swashplate •• 605. 

### -Check of the swashplate bearings •..•••••.•.•...•••••••••••••.• 606

- Torsion tie bar check (Post MOD 76171) •• o •••••••••••••••••••••

### 607 

# I

- Measuring rotational loads on MRH sleeves ••.•o o•••o••••••••• 0. 

### 608 -Monitoring of tension torsion bar pins 341A31.4228.20.23,

bolts 341A31.4237.20.22 and yokes 341A31.4242.20 •••••••••••••• 609



### - Checking the locking sleeve on a dynamic frequency adapter

pin ................................................................. 610 

### REPAIR

- Replacing the locking sleeve on a dynamic frequency adapter pin ............................................................801 

### -Corrosion treatment for MRH 

### pitch-control rods ····•••o···•oo.802 PRESERVATION - DEPRESERVATION



### - Preservation - depreservation of main rotor bead/shaft assembly ................................................................901 

### -Preservation- depreservation of dynamic adapters .••.••••••••902

08-04 

### 65.12.P3 Page2**~** Ill 10 11> 0'\ 0 -...10'\ l11 ,_. . ......

,_. WN I I I I I a! REFER 1.5 TO **~** CARDNo

fi so .11 page

61 MAIN ROTOR HEAD Torsion Tie-Bar Check (Post MOD 076171)

A GENERAL This visual check of the torsion tie-bars can be

carried out using a magnifying glass with a maximum

magnification level of 10.

B PRELIMINARY STEPS Remove the torsion tie-bars as per the referenced

Repair Manual Work Card.

C TORSION TIE-BAR INSPECTION (Figure 1) NOTE: During the visual and dimensional check of the

torsion tie bars, an angle may be found between

the bushings. Angle a (view on arrow F) is acceptable if it

is lower than 7°. Otherwise, return the torsion

tie bar to Eurocopter Marignane.

1 Visual check of the polyurethane coating

(Detail B) NOTE: Two cracks that are less than 5 mm (.196 in)
----

apart are to be considered as a single crack.

- Make sure that there are no cracks (2) in the

polyurethane coating:

.

If one or more cracks, 5 rnm {.196 in) long or

less, are found, leave the part as it is.

.

If a crack more than 5 mm (.196 in) long is

found, return the torsion tie-bar to the EUROCOPTER

Marignane plant for examination by

an expert

. CAUTION: THE POLYURETHANE COATING MUST NOT BE RE-WORKED

IN ANY WAY. Trade Time GAZELLE 65.12.607 l/3 Necessary tools and materials Special Tools

- Magnifying glass

-

Outside micrometer

-

Inside micrometer Materials

- Scotch Brite pad

-

Abrasive paper, 400 grit

-

Paint, P05 r 08-08'U Ill <.0 CD I I 0\0\ OU1 ..J• 1-' fl.)[\.) C) REFER I c TO i CARDNo R 20.04.05.402 50.11 page 61 MAIN ROTOR HEAD Torsion Tie-Bar Check (Post MOD 076171)

2 Inspection of the bushings (1)

- Check the condition of the bushings

.

Check for corrosion or fretting on the inside diameter: GAZELLE Gs-.12.607 2

- Rub any corrosion with a Scotch Brite pad and if the corrosion remains,

discard the torsion tie-bar.

- Using an outside micrometer, measure the thickness (a) of the bushings:

.

if the thickness is less than 37.520 mm {1.477 in), discard the torsion tie-bar.

- Using an inside micrometer, measure the inside diameter (b) of the bushings:

• if the diameter is larger than 21.040 mm (.828 in), discard the torsion tie-bar.

- Check the condition of the varnish on the two faces of each bushing:

.

if varnish is missing from less than 15 % of the surface area on one face of the

bushing:

- Leave the part as it is.

If

varnish is missing from more than 15 % of the surface area on one face of the bushing:
- Remove all the varnish from the face using 400-grit abrasive paper. Finish

with a Scotch Brite pad.

-

Protect the face with a

**coa~** of POS paint (refer to the referenced MTC Work

Card)

.

D FINAL STEPS Install the torsion tie-bars as per referenced MRR Work Card. 1 oa-as'U Ill IQ m O'lc:tl 001 .....:1• .... WN 1 Ft

I Bolt 1

A

ECF P/N 704A33633274 J-23750-1 LORD DAYTON OH USA 30061 ( )( )-( )( ) { , AA VIEW ON ARROW F DETAIL B a **zzzzTz?zt?~ ~**  **\.~2** 1 **~-**

- -- I -l\-- ----tt- I b BOJ--, 1 **~~** ' Figure 1 GAZELLE 65.12.607 3 08-08