8AeJETSTREAJII 

Senes 4ffJIJ 

SERVICE BULLETIN 

BAE SYSTEMS (OPERATIONS) LIMITED, 

PRESTWICK INTERNATIONAL AIRPORT, 

AYRSHIRE, KA9 2RW, 

SCOTLAND. 

TRANSMITTAL SHEET 

J41-27-068 

This page transmits the original issue of service bulletin J41-27 -068, pages 1 through 12. 

TITLE: FLIGHT CONTROLS -INSPECTION OF ELEVATOR TRIM CIRCUIT TRAVEL STOPS 

AND SERVO MOTOR LIMIT MICRO SWITCH RIGGING 

INSPECTION 

ORIGINAL ISSUE: JAN 21 /14 J41-27-068 

PAGE 1 of 1 

8AeJETSTREAJII 

Series 4~1JIJ 

SERVICE BULLETIN 

BAE SYSTEMS (OPERATIONS) LIMITED, 

PRESTWICK INTERNATIONAL AIRPORT, 

AYRSHIRE, KA9 2RW, 

SCOTLAND. 

J41-27-068 

TITLE: FLIGHT CONTROLS -INSPECTION OF ELEVATOR TRIM CIRCUIT TRAVEL STOPS 

AND SERVO MOTOR LIMIT MICRO SWITCH RIGGING 

INSPECTION 

1. PLANNING INFORMATION 

A. Effectivity 

All Jetstream Series 41 00 aircraft. 

B. Reason 

An incident occurred where the aircraft pitched down during the final approach phase 

with the landing gear lowered and the autopilot disconnected. Despite the control 

column being held fully aft, the aircraft continued to lose height, and the crew then 

found that the pitch trim circuit was fully nose down. It took considerable effort to free 

the circuit from that position, but control was then regained. 

Subsequent investigation showed that the pitch trim cable travel stop plates in the 

centre console had failed, allowing the swaged stop to over travel past the plates. When 

the crew tried to trim the aircraft nose up, the stop then snagged on the edge of the stop 

plate. 

C. Description 

A one off inspection is required to ensure that, when the pitch trim servo is operated to 

the limits of its travel, both pitch up and down, the cable travel stops do not contact the 

stop plates. The stop plates are also inspected to ensure that they have not been 

damaged. 

The tasks are as follows: 

- Gain access to rear of centre console. 

- Operate electrical pitch trim switches fully up and fully down. 

- Check that the travel stops do not contact the travel stop plates. 

- Check and rectify the rigging if defective. 

- Inspect the travel stop plates, replace if necessary. 

- The aircraft records are amended. 

ORIGINAL ISSUE: JAN 21 /14 J41-27-068 

PAGE 1 of 12 
D. Manpower 

1 man-hour. 

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Mechanical and electrical skills are necessary. 

E. Material - Cost and Availability 

The Modifications Group, BAE Systems (Operations) Limited, Prestwick International 

Airport, Ayrshire, KA9 2RW, SCOTLAND, will give you terms and conditions for the 

supply of material. 

F. Tooling- Price and Availability 

None. 

G. Weight and Balance 

None. 

H. Aircraft Noise Levels 

Not affected. 

I. Electrical Load Data 

Not affected. 

J. Software Accomplishment Summary 

Not applicable. 

K. References 

- Aircraft Maintenance Manual, Chapters 12-21-24, 22-10-18 and 27-35-00. 

L. Publications Affected 

None. 

M. Family Tree Of Modification Relationships 

J41-27-068 

PAGE2 

Not applicable. 

ORIGINAL ISSUE: JAN 21 /14 
N. Approval 

IUeJETSTREAM 

s.dss "'"'" SERVICE BULLETIN 

The technical content of this service bulletin is the subject of EASA Airworthiness 

Directive consultation. 

Compliance with this service bulletin must be achieved as follows: 

By the 301

h April2014. 

The technical content of this service bulletin is approved under the authority ot EASA 

PART 21 Approval No. EASA.21J.047 . 

Signed .............. 6~, ................................. .. 

Date ........... .... . .'.l:. (/( /.t. fr. ... ............. ....... . 

EASA Part 21 Approval No. EASA.21J.047. 

ORIGINAL ISSUE: JAN 21 /14 J41-27-068 

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J41-27-068 

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ORIGINAL ISSUE: JAN 21 /14 
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2. ACCOMPLISHMENT INSTRUCTIONS 

WHENEVER ANY PART OF THE MAIN OR ASSOCIATED SYSTEM IS DISMANTLED, 

ADJUSTED, REPAIRED OR RENEWED, THAT PART OF THE SYSTEM WHICH HAS 

BEEN DISTURBED SHALL BE SUBJECTED TO A SECOND INDEPENDENT INSPECTION 

FOR SECURITY OF LOCKING DEVICES, FULL AND FREE MOVEMENT, DIRECTION AND 

TENSION CHECKS. THIS WORK MUST BE DONE IN ACCORDANCE WITH THE 

ACCEPTABLE MEANS OF COMPLIANCE M.A. 402 (a) TO EASA PART M, OR TO AN 

EQUIVALENT NATIONAL STANDARD. 

WARNING: MAKE SURE THE AIRCRAFT AND THE AIRCRAFT SYSTEMS ARE MADE 

SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFT 

MAINTENANCE MANUAL. 

CAUTION: TO AVOID DAMAGE, MAKE SURE BEFORE MOVING CONTROLS THAT 

CONTROL RUNS AND CONTROL SURFACES ARE FREE FROM 

OBSTRUCTION. 

NOTE: Abbreviations used in the accomplishment instructions of this service bulletin 

are: 

AMM - Aircraft Maintenance Manual. 

A. Preparation 

(1) Refer to AMM , chapter 27-35-00. Gain access to rear of centre console and 

remove access panels 230BRW, 230BLW, 230CRW and 230CLW. 

B. Accomplishment 

(1) Connect the external electrical power to the aircraft, refer to AMM, chapter 

12-21 -24 (Ref. AMM 12-21 -24-860-801 ). 

(2} Refer to AMM , chapter 27-35-00. Operate electrical pitch trim switches fully 

up and fully down. Make sure that the travel stops do not contact the travel 

stop plates. 

(3) Check rigging. If the rigging is found to be defective refer to AMM, chapter 

22-1 0-18 to rectify. 

(4) Correctly adjust the electric trim limit switches (Ref. AMM 22-10-18-820-

806). 

(5) Refer to Figure 1. Inspect the travel stop plates part number 14127025-51 (1 

to 3 off per aircraft). Check for damage or broken stop arms. Replace 

damaged stop plates if necessary. 

NOTE: There are two different standards of stop plates. Both have the same part 

number. Early production stop plates have shorter stop arms. It is recommended 

that any early type stop plates are replaced with later production stop plates. 

The stop plates are made of tufnol. 

ORIGINAL ISSUE: JAN 21 /14 J41-27-068 

PAGE 5 
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C. Recovery 

(1) Refer to AMM, chapter 27-35-00, gain access to the rear of the centre 

console and install access panels 230BRW, 230BLW, 230CRW and 

230CLW. 

(2) Disconnect external electrical power to the aircraft, refer to AMM, chapter 

12-21-24 (Ref. AMM 12-21-24-860-805). 

(3) Aircraft records: 

(a) Add inspection service bulletin number J41-27-068 to the aircraft 

records. 

NOTE: Operators are reminded of the necessity to inform the Business Support Team, 

Technical Publications, BAE Systems (Operations) Limited, Prestwick International 

Airport, Ayrshire, KA9 2RW, SCOTLAND, of the accomplishment of this service 

bulletin in order to obtain the necessary revisions for the affected manuals, see 

paragraph 1.L. Publications Affected, of this service bulletin. 

NOTE: Operators are also reminded that it is their responsibility to amend the aircraft 

weighing report, if necessary, in accordance with the weight and balance changes 

given at paragraph 1.G. of this service bulletin. 

J41-27-068 

PAGE 6 

ORIGINAL ISSUE: JAN 21 /14 
--I I~ I I 

0.225in 

(5.715mm) 

TYPICAL 

8AeJETSTREA.M 

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SERVICE BULLETIN 

SHORT 

STOP ARM 

0 

EARLY PRODUCTION 

STOP PLATE 

14127025-51 

STOP PLATES 

FIGURE 1 

LONG 

STOP ARM 

0 

LATER PRODUCTION 

STOP PLATE 

14127025-51 

ORIGINAL ISSUE: JAN 21 /1 4 

27-35-1 0019 

J41-27-068 

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PAGES 

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ORIGINAL ISSUE: JAN 21 /14 
3. MATERIAL INFORMATION 

A. New parts supplied 

Not applicable. 

8AeJETSTREAJII 

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B. Replacement Parts - Operators Supply 

Not applicable. 

C. Instruction Dispositions Notes 

Not applicable. 

ORIGINAL ISSUE: JAN 21 /14 J41-27-068 

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ORIGINAL ISSUE: JAN 21 /14 
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4. CONTINUED AIRWORTHINESS 

A. Continued Airworthiness Instructions 

There are no continued airworthiness instructions applicable to this service bulletin. 

B. Scheduled Maintenance 

( 1) Not applicable. 

C. Removal Procedures 

(1) Not applicable. 

D. Installation Procedures 

(1) Not applicable. 

E. Test Procedures 

(1) Not applicable. 

F. Trouble Shooting 

(1) Not applicable. 

ORIGINAL ISSUE: JAN 21 /14 J41 -27-068 

PAGE 11 
J41-27-068 

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ORIGINAL ISSUE: JAN 21/14 
BAE SYSTEMS 

ACCOMPUSHMENTREPORT 

I SERVICE BULLETIN NUMBER 

TO: BUSINESS SUPPORT TEAM, 

TECHNICAL PUBLICATIONS, 

BAE SYSTEMS (OPERATIONS) LIMITED, 

PRESTWICK INTERNATIONAL AIRPORT, 

AYRSHIRE, KA9 2RW, 

SCOTLAND. 

Telephone: (01292) 675207 

Fax: (01292) 675704 

J41·27-068 

E-mail : RAPublications@baesystems.com 

PLEASE BE ADVISED THAT THE ABOVE SERVICE BULLETIN HAS BEEN EMBODIED ON 

AIRCRAFT CONSTRUCTORS NUMBER(S): 

WE REQUEST THE APPROPRIATE REVISIONS TO APPLICABLE MANUALS. 

NAME: ................................................................................ .. 

SIGNED: .............................................................................. . 

COMPANY: ......................................................................... . 

DATE: ................................................................................. . 

SERVICE BULLETIN COMMENTS/FEEDBACK 

Please report any non-technical comments or inaccuracies regarding this service bulletin to the 

above address.