WYTWÓRNIA SPRZĘTU KOMUNIKACYJNEGO 

„PZL-ŚWIDNIK”

SPÓŁKA AKCYJNA 

 Al. Lotników Polskich 1 

21-045 Świdnik, Poland 

Tel. (+48 81) 468 09 01, 751 20 71 

Fax (+48 81) 468 09 19, 751 21 73

UpowaŜnienie /certyfikat EASA:

 EASA. 21J.114

The technical contents of this document have been approved 

by Transportation Equipment Factory „PZL-Świdnik” S.A. 

under the authority of DOA No. EASA.21J.114. 

 

SERVICE BULLETIN No. BS-37-09-230 

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

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 2009
 

2/7 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 longitudinal control system hydraulic actuator fork end 

caused by loosening and rotation of the GT40PCz8B generator air outlet collector. 

To eliminate the possibility of control stick movement 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 one. 

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 against rotation shall be provided and the clamping rings 

connection with upper and lower collector walls shall be reinforced, if they are of welded type. 

This bulletin shall be accomplished also on new GT40PCz8B generators installed in 

helicopters, if they are replaced. Do not accomplish this bulletin in the scope of reinforcing the 

clamping rings connection with upper and lower collector walls using rivets if they have been already 

installed by the manufacturer. 

At the same time, the helicopter operation documentation 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 generator (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 the clamping rings have been already riveted by 

the generator manufacturer); 

3) Rivet the cable 30.25.005.00.00 to the upper part of collector in accordance with Sketch 1; 

4) Install the collector on the generator and secure the protective cable 30.25.005.00.00 to the 

torquemeter transducer cover in accordance with Sketch 2. Use the spring washer and the bolt 

3155A-6-10 securing the clip with the electrical loom. 

5) During the collector installation, make sure that after it has been fixed with screws on the 

generator and the protective cable has been installed, 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 allowed to make an undercut on both parts of 

collector at the same time. The undercut edges should be protected with the WŁ-02 primer; 

− The protective cable should be loose and the collector air outlet should be directed vertically 

downward. The cable clearance quantity may enable to rotate the collector (after loosening the 

screws) not more than 5° towards the control linkage; 

− The collector should be rigidly installed and should not rotate around the generator when 

moving it with hands; 

6) After the collector installation, the screws shall be protected against untightening by securing them 

in pairs with the pb-II-Na φ0.8 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 φ0,8 l = 0,5 m 

Section IV 

The GT40PCz8B generator air outlet collector attachment shall reworked by Operator or PZLŚwidnik S.A. service team on Operator’s request. 

The parts required for the bulletin accomplishment shall be manufactured and delivered by 

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

. 

Section V 

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

The GT40PCz8B generator air outlet collector attachment reworked. 

For reference, write this bulletin number together with its accomplishment date and confirm it 

with signature and stamp of the person who accomplished it. 

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

a) Introduce Revision 6 dated September 2009 to Chapter 24 in PZL W-3A Helicopter / PZL 

W-3A Model Maintenance Manual, Doc. No. AE 30.04.20.1 MM (English-language edition) 

and AE 30.04.20.1 IOT (Polish-language edition). For 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, 203, 206; 

 – add pages: 203A, 203B; 

b) Introduce Revision 1 dated September 2009 to Chapter 24 in PZL W-3A Helicopter / PZL 

W-3AS Model Maintenance Manual, Doc. No. AE 31.03.05.0 MM (English-language edition) 

and AE 31.03.05.0 IOT (Polish-language edition). For 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, 203, 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.) 

15 
 

BS-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 welded 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 machine. 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 accordance 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 with Sketch 2. 

Use the spring washer and the bolt 3155A-6-10 securing the clip to the electrical loom. Fix the 

collector by tightening the clamps with bolts. 

5) During the collector installation, make sure that after it has been fixed with screws on the 

generator and the protective cable has been installed, 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 allowed to make an undercut on both parts of 

collector at the same time. The undercut edges shall be protected with the WŁ-02 primer; 

− The protective cable should be loose and the collector air outlet should be directed vertically 

downward. The cable clearance quantity may enable to rotate the collector (after loosening 

the screws) not more than 5° towards the control linkage; 

− The collector should be rigidly fixed and should not rotate around the generator when 

moving it with hands; 

6) After the collector installation, the screws shall be protected against untightening by securing 

them in pairs with the pb-II-Na φ0.8 lockwire. 

7) Degrease the machined places with gasoline, protect 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 φ0.8 0.02 kg