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 

Direction Technique Support 

Aeroport International de Marseflle Provence 

13725 Marignane Cedex-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 

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6 08.91 

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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 

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indicates the pages affected by the 

Date 

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08.08 

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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 

GAZELLE HELICOPTER 

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 ................................................................. 61 0 

REPAIR 

- Replacing the locking sleeve on a dynamic frequency adapter 

pin ............................................................ 8 01 

-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 
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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 

Necessa

Special Too

- Magnifying 

- Outside m

- Inside mi

Materials 

- Scotch Br

- Abrasive p

- Paint, P05 
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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: 

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

discard the torsion tie-bar. 

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

. if the thickness is less than 37.520 mm {1.477 in), discard t

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

• if the diameter is larger than 21.040 mm (.828 in), discard t

- Check the condition of the varnish on the two faces of each bus

. if varnish is missing from less than 15 % of the surface area 

bushing: 

- Leave the part as it is. If varnish is missing from more than 15 % of the surface area 

bushing: 

- Remove all the varnish from the face using 400-grit abras

with a Scotch Brite pad. 

- Protect the face with a coa~ of POS paint (refer to the r

Card) . 

D FINAL STEPS 

Install the torsion tie-bars as per referenced MRR Work Card. 
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