WYTWÓRNIA SPRZ Ę TU KOMUNIKACYJNEGO „PZL- Ś WIDNIK” SPÓŁKA AKCYJNA

Al. Lotników Polskich 1
21-045 Ś widnik, Poland Tel. (+48 81) 468 09 01, 751 20 71 Fax (+48 81) 468 09 19, 751 21 73 Upowa Ŝ nienie /certyfikat EASA:
EASA. 21J.114

The technical contents of this document have been a pproved by Transportation Equipment Factory „PZL- Ś widnik” S.A. under the authority of DOA No. EASA.21J.114

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# SERVICE BULLETIN No. BS-37-09-230

NAZWA-TYP/MODEL: PZL W -3A / PZL W -3A model and PZL W -3AS helicopters

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SERIA/NUMER: All.

DOTYCZY: 1. PROTECTION AGAINST ROTATION OF GT40PCz8B
GENERATOR AIR OUTLET COLLECTOR.
2. UPDATING THE MAINTENANCE MANUAL.

TERMIN REALIZACJI: Within 4 months from the bulletin approval date.

13 October 20092/7 BS-37-09-230 Section I

In the PZL W-3A helicopter / PZL W-3AS model, there was a case of control stick movement limitation „towards the pilot”, in one fourth from the entire range. This incident resulted from locking of the longitud inal control system hydraulic actuator fork end caused by loosening and rotation of the GT40PCz8B g enerator air outlet collector. To eliminate the possibility of control stick movem ent locking, a cable protecting the collector against rotation was fitted during assembly. The generator manufacturer reinforced the clamping rings which tightly connect both parts of collector by replacing the welded connection by the riveted o ne.
In relation to the above, in all serviceable PZL W- 3A / PZL W-3A model and the W-3AS helicopters, a cable protecting the collector again st rotation shall be provided and the clamping ring s connection with upper and lower collector walls sha ll be reinforced, if they are of welded type. This bulletin shall be accomplished also on new GT4 0PCz8B generators installed in helicopters, if they are replaced. Do not accomplis h this bulletin in the scope of reinforcing the clamping rings connection with upper and lower coll ector walls using rivets if they have been already installed by the manufacturer.
At the same time, the helicopter operation document ation has been revised by introducing the collector inspection for attachment security during 25-hour/15-day inspection.

Section II

This bulletin shall be accomplished in accordance with the procedure and sketches attached to this bulletin as well as the following instructions : 1) Remove the air collector from the GT40PCz8B gene rator (see Sketch 1);
2) Reinforce the clamping rings welded connections by making additional riveting in accordance with Sketch 1 (reinforcement shall not be made if t he clamping rings have been already riveted by the generator manufacturer);
3) Rivet the cable 30.25.005.00.00 to the upper par t of collector in accordance with Sketch 1;
4) Install the collector on the generator and secur e the protective cable 30.25.005.00.00 to the torquemeter transducer cover in accordance with Ske tch 2. Use the spring washer and the bolt 3155A-6-10 securing the clip with the electrical lo om. 5) During the collector installation, make sure tha t after it has been fixed with screws on the generator and the protective cable has been install ed, the following conditions are complied with:

− The clearance between edges of the upper and lower parts of collector shall be 2 to 4 mm (see Sketch 1). If this clearance is too small, an undercut should be made in the edge of lower or upper part of collector, symmetrically on both sides. It is allow ed to make an undercut on both parts of collector at the same time. The undercut edges shou ld be protected with the WŁ-02 primer;

− The protective cable should be loose and the collec tor air outlet should be directed vertically downward. The cable clearance quantity may enable t o rotate the collector (after loosening the screws) not more than 5 ° towards the control linkage;

− The collector should be rigidly installed and shoul d not rotate around the generator when moving it with hands;
6) After the collector installation, the screws sha ll be protected against untightening by securing th em in pairs with the pb-II-Na φ 0.8 lockwire.
7) Replenish the enamel coating in place of rework.BS-37-09-230 3/7 Section III

List of parts required to accomplish the bulletin

Item Description Dwg/standard No. or type Q-ty/helicopter Notes

1 Cable 30.25.005.00.00 1

2 Rivet NAS 1738 B-4-2 17

3 Lockwire pb-II-Na φ 0,8 l = 0,5 m

Section IV

The GT40PCz8B generator air outlet collector attach ment shall reworked by Operator or PZLŚ widnik S.A. service team on Operator’s request. The parts required for the bulletin accomplishment shall be manufactured and delivered by

PZL- Ś widnik S.A on order and cost of the Operator.

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Section V

1) After the bulletin accomplishment, make the foll owing entry in the Helicopter Log Book:

The GT40PCz8B generator air outlet collector attach ment reworked. For reference, write this bulletin number together with its accomplishment date and confirm it with signature and stamp of the person who accompli shed it.

2) After receiving the bulletin, introduce the foll owing revisions in operational documentation:

a) Introduce Revision 6 dated September 2009 to Cha pter 24 in PZL W-3A Helicopter / PZL W-3A Model Maintenance Manual, Doc. No. AE 30.04.2 0.1 MM (English-language edition) and AE 30.04.20.1 IOT (Polish-language edition). Fo r this purpose:

− In List of Effective Pages – replace page 1;

− In Table of Contents – replace page 1;

− In Subchapter 24.21.00 – replace pages: 201, 202, 2 03, 206; – add pages: 203A, 203B; b) Introduce Revision 1 dated September 2009 to Cha pter 24 in PZL W-3A Helicopter / PZL W-3AS Model Maintenance Manual, Doc. No. AE 31.03.0 5.0 MM (English-language edition) and AE 31.03.05.0 IOT (Polish-language edition). Fo r this purpose:

− In List of Effective Pages – replace page 1;

− In Table of Contents – replace page 2;

− In Subchapter 24.21.00 – replace pages: 201, 202, 2 03, 206; – add pages: 203A, 203B;4/7 BS-37-09-230 

### Sketch 1. Installation of protective cable 30.25. 005.00.00 on air collector and

reinforcement of camping rings attachment.

7 (typ.)

Air outlet (ref.) Cable 30.25.005.00.00 Rivet NAS 1738 B-4-2

Air collector (from the GT40PCz8B set)

80

Camping ring (ref.)2÷4 (typ.)

12 (typ.)7 (typ.) 15BS-37-09-230 5/7



### Sketch 2. Installation of cable on main gearbox

Clip 8-A-I-Zn-3886-05 (ref.) or Band clip 4-4 OST1 12090-75 (ref.) View in direction of flight (rear view) to the left side of main gearbox.

Torquemeter transducer cover (ref.)

Cable 30.25.005.00.00

Air collector

on generator (ref.) Spring washer Z6,1 Fe/Cd9c PN-77/M-82001 (ref.) Bolt 3155A-6-10 (ref.) Electrical loom (ref.)6/7 BS-37-09-230 

### Work procedure.

1) Open the main gearbox covers. Remove the air collector from the GT40PCz8B gearbox (see Sketch 1). For this purpose,
remove lockwire from bolts and loosen the bolts.

2) Make additional reinforcement of camping rings w elded connection by riveting in accordance
with Sketch 1. Mark and make eight Ø 3.7 holes for NAS 1738 B-4-2 rivets both in the upper and lower part
of collector. Install rivets (16 items) using the riveting machin e. Protect the rivet heads with the WŁ-02 primer.

3) Mark and make the Ø 3.7 hole for the NAS 1738 B- 4-2 rivet securing the cable 30.25.005.00.00 to the upper part of collector in a ccordance with Sketch 1 (dimension 80 mm from the plane of symmetry). Secure the cable by installing the rivet fixing the cable 30.25.005.00.00.

4) Install the collector initially on the generator and secure the protective cable 30.25.005.00.00 to the torquemeter transducer cover in accordance w ith Sketch 2. Use the spring washer and the bolt 3155A-6-10 secur ing the clip to the electrical loom. Fix the collector by tightening the clamps with bolts.

5) During the collector installation, make sure tha t after it has been fixed with screws on the generator and the protective cable has been install ed, the following conditions are complied
with:

− The clearance between edges of the upper and lower parts of collector shall be 2 to 4 mm (see Sketch 1). If this clearance is too small, an undercut should be made in the edge o flower or upper part of collector, symmetrically on both sides. It is al lowed to make an undercut on both parts of collector at the same time. The undercut edges shal l be protected with the WŁ-02 primer;

− The protective cable should be loose and the collec tor air outlet should be directed vertically downward. The cable clearance quantity may enable t o rotate the collector (after loosening the screws) not more than 5 ° towards the control linkage;

− The collector should be rigidly fixed and should no t rotate around the generator when moving it with hands;

6) After the collector installation, the screws sha ll be protected against untightening by securing them in pairs with the pb-II-Na φ 0.8 lockwire.

7) Degrease the machined places with gasoline, prot ect with primer and then replenish the enamel coating.

8) Close the gearbox covers.BS-37-09-230 7/7 LIST OF COMMERCIAL TOOLS AND DEVICES

Item Description Type Q-ty Notes
1) Drill NWKa Ø 3,7 1
2) Flat wrench RWPd 10 x 12 1
3) Shears RNBg 1
4) Slide caliper MAUb-140 1
5) Rule MLPd-630 1
6) Milling cutter NFXa 6x20 1
7) Riveting machine FACOM Y.103A 1
8) Pliers RSDg 160 1



### LIST OF SPECIALIST TOOLS AND DEVICES

Item Description Type Q-ty Notes 1) Pneumatic drill 18-41-032189 1

2) Socket wrench S=10 18-62-22190 1



### LIST OF ACCESSORY MATERIALS

Item Description Type Q-ty Notes
1) Primer 7429-659-130 or Wł-02 50 ml
2) Brush RYBS-20 1
3) Flannel 1917-11-001-3 1 running

meter 4) EP enamel (black) 50 ml
5) Gasoline B-70 150 ml or extraction naphtha 6) Pencil 1
7) Lockwire Pb-II-Na φ 0.8 0.02 kg