MARSHALL AEROSPACE AND DEFENCE GROUP

THE AIRPORT, CAMBRIDGE, ENGLAND

SERVICE BULLETIN

Letter of Transmittall

Page 1 of 1

MARSHALL AEROSPACE AND DEFENCE GROUP SERVICE BULLETIN SBM 200

MARSHALL AEROSPACE AND DEFENCE GROUP BRAKE MASTER CYLINDER PIVOT PIN 

EXAMINATION

© 2015 Marshall Aerospace and Defence Group

THE INFORMATION CONTAINED IN THIS DOCUMENT CONTAINS PROPRIETARY DATA WHICH IS THE

PROPERTY OF MARSHALL AEROSPACE AND DEFENCE GROUP AND IS DISCLOSED IN CONFIDENCE. THE DATA

OR DOCUMENT SHALL NOT BE USED, DISCLOSED TO OTHERS OR REPRODUCED WITHOUT EXPRESS

WRITTEN PERMISSION OF MARSHALL AEROSPACE AND DEFENCE GROUP. IF CONSENT IS GIVEN, THIS

PROPRIETARY DATA NOTIFICATION SHALL APPEAR IN ANY REPRODUCTION, WHETHER IN WHOLE OR IN

PART.

Issued By

Marshall Aerospace and Defence Group

The Airport, Cambridge, CB5 8RX

LETTER OF TRANSMITTAL

Dated April 2015

This page transmits Initial Issue of Service Bulletin SBM 200

RECORD OF REVISIONS

Revision No. Date Reason for Change

0 Initial Issue

1 April 2015 Amendment to Compliance - Accomplishment Timescales.

MARSHALL AEROSPACE AND DEFENCE GROUP

SERVICE BULLETIN

SBM 200

Apr 15 (Rev 1) Page 1 of 8

 BRAKE MASTER CYLINDER PIVOT PIN EXAMINATION

1. PLANNING INFORMATION

A. EFFECTIVITY

Slingsby T67 Firefly T67B, T67C Series, T67M, T67M Mkll, T67M200, T67M260.

B. CONCURRENT REQUIREMENTS

None

C. REASON

A case has been reported of the failure of a brake master cylinder pivot pin part number T67M-45-

539 (Figure 1). Two of these pivot pins are fitted per aircraft, one to the #1 pedal assembly and one 

to the #4 pedal assembly. The operator reported hearing a breaking noise from the rudder pedal 

area during taxying. An investigation was carried out and it was discovered that the brake master 

cylinder pivot pin had broken on the #4 pedal assembly.

The pin was broken between the threaded section and the larger central barrel (Figure 2). The 

surface of the broken material was found to be dull, indicating a possible fatigue related fracture.

Unrelated to the pivot pin failure instances of dimensional differences to the brake master cylinder 

pivot pin design have been discovered (Figure 3).

D. DESCRIPTION

This Service Bulletin (SB) details the examination for damage and dimensional inconsistencies to 

the brake master cylinder pivot pin.

E. COMPLIANCE

(1) Classification

Essential

(2) Accomplishment Timescales

Before next flight, unless SBM-200 Revision 0 has been carried out. Thereafter at each 

annual inspection in conjunction with SB187 or SB188 as applicable.

F. APPROVAL

Marshall Aerospace and Defence Group EASA Design Organization Approval No EASA.21J.181.
MARSHALL AEROSPACE AND DEFENCE GROUP

SERVICE BULLETIN

SBM 200

Mar 15 Page 2 of 8

G. MANPOWER

One person – approximate man-hours as follows:

H. WEIGHT AND BALANCE

No change.

I. ELECTRICAL LOAD DATA

No change.

J. SOFTWARE SUMMARY

Not Applicable.

K. REFERENCES

Marshall Aerospace and Defence Group 

Firefly T67 Maintenance Manual.

L. OTHER PUBLICATIONS AFFECTED

Not Applicable.

M. INTERCHANGEABILITY/INTERMIXABILITY OF PARTS

Not Applicable.

2. MATERIAL INFORMATION

A. MATERIAL - PRICE AND AVAILABILITY

Not Available.

B. INDUSTRY SUPPORT INFORMATION

Not Applicable.

C. MATERIAL NECESSARY FOR EACH AIRCRAFT

Loctite 222.

Locking wire to DTD189A.

2 off Split Pins Pt. No. 120-15-132.

Preparation 1

Inspection / Rectification 1 (excluding NDI inspection)

Testing 1

Re-assembly 1

Records 1

Total 5 (excluding NDI inspection)
MARSHALL AEROSPACE AND DEFENCE GROUP

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SBM 200

Mar 15 Page 3 of 8

D. MATERIAL NECESSARY FOR EACH SPARE

Not Applicable.

E. REIDENTIFIED PARTS

Not Applicable.

F. TOOLING - PRICE AND AVAILABILITY

Not Applicable.

3. ACCOMPLISHMENT INSTRUCTIONS

A. MAINTENANCE PRACTICES

WARNING: OBEY ALL WARNINGS, CAUTIONS AND MAINTENANCE PRACTICES. IF YOU 

DO NOT OBEY THIS WARNING THERE IS A RISK OF INJURY TO PERSONNEL 

AND/OR DAMAGE TO THE EQUIPMENT.

(1) Observe all safety procedures.

(2) All engineering and local procedures are to be observed whilst embodying this Service 

Bulletin.

(3) After inspection ensure aircraft is clean and clear of tools and miscellaneous equipment and 

any removed parts are replaced.

B. PREPARATION

Prior to proceeding, ensure that the Service Bulletin has been read in its entirety and is 

understood.

C. INSPECTION

(1) Rudder pedal assembly #1:

(a) Remove rudder pedal stop screw (1) and slide assembly aft from its housing.

(b) Remove and discard locking wire (2).

(c) Remove the split pin (3) and washer (4). Discard split pin.

(d) Slide off lower inner bracket from main brake cylinder pivot after removing bracket, 

attached with 2 off socket head screws.

(e) Displace brake cylinder (5) inboard to clear top pivot.

(f) Remove pivot pin (6) by unscrewing.

NOTE: The pivot pin is bonded in position.
MARSHALL AEROSPACE AND DEFENCE GROUP

SERVICE BULLETIN

SBM 200

Mar 15 Page 4 of 8

(g) Carry out visual inspection of brake master cylinder pivot pin for damage, cracks or 

distortion (Reference Figure 1 and Figure 2).

(h) Carry out visual inspection for dimensional accuracy of threaded portion of the brake 

master cylinder pivot pin (Reference Figure 1 and Figure 3). (Ensure that threaded 

portion is 5 mm in length, and adjacent shank is 2.5 mm in length).

(i) Carry out NDI (fluorescent dye penetrant), using local regulations, of the brake master 

cylinder pivot pin threaded portion and shank where it enters the central barrel. 

(j) If any damage, crack or distortion to the brake master cylinder pivot pin is discovered 

or the pivot pin fails the dimensional requirement then it is considered to be 

unserviceable and is to be replaced.

(k) If no damage, crack or distortion to the brake master cylinder pivot pin is found and the 

pivot pin meets the dimensional requirements, re-assemble in reverse of the removal 

procedure, using a new split pin. The pivot pin (6) is bonded in position using Loctite 

222. Ensure that wire-locking does not foul on any adjacent structure or components. 

(2) Repeat Para 2.C1 to rudder pedal assembly #4.

D. MODIFICATION

Not applicable.

E. TESTING

(1) Carry out operational check of the rudder control system for full and free movement.

(2) Carry out operational check of the aircraft wheel brake control system, IAW Aircraft 

Maintenance Manual P4-44, 4.7, ensuring no binding at the brake master cylinder pivots.

F. COMPLETION

(1) Annotate airframe logbook or aircraft record with - SBM 200 carried out (in accordance with 

local requirements). 

(2) Retain the damaged parts for further inspection and reported to Marshall Aerospace and 

Defence Group (MADG) using the User Experience Report (UER) system in accordance with 

the Aircraft Maintenance Manual.

For any replaceable parts or materials contact Marshall Aerospace and Defence Group Product 

Support Department contact details as below:

Mr M Bright

Technical Group Support Engineer 

Marshall ADG 

The Airport

Cambridge

CB5 8RX UK 

Tel. No. +44 (0) 1223 399856

+44 (0) 7825365617

Email: mark.bright@marshalladg.com
MARSHALL AEROSPACE AND DEFENCE GROUP

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SBM 200

Mar 15 Page 5 of 8

Examination - Brake Master Cylinder Pivot Pin

Figure 1 
MARSHALL AEROSPACE AND DEFENCE GROUP

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Pivot pin

Figure 2 
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Pivot pin threads

Figure 3 
MARSHALL AEROSPACE AND DEFENCE GROUP

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Mar 15 Page 8 of 8

SBM 200 ANNEX A

BRAKE MASTER CYLINDER PIVOT PIN EXAMINATION

This form is to be completed and submitted to the address below.

Mr M Bright

Technical Group Support Engineer

Marshall ADG

The Airport,

Cambridge,

CB5 8RX

UK

mark.bright@marshalladg.com

Aircraft works number

SB 200 carried out

Total Flight Hours

Details of action required

Reporters contact details i.e. Name, 

Address, e-mail, telephone etc

Owner’s details