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# SERVICE BULLETIN BAE SYSTEMS (OPERATIONS) LIMITED, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND
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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

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# 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 lim its 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
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### Signed 

# ...... ........

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# .............. ................ ..... Date 

### ... ........ .. .. ..'.l:.(/(

# /.t. fr. ... .......... ... ... . . .. . 

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

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

### PAGE3J41-27-068 PAGE4 

## 8AeJETSTREAM Ssriss "''()(} SERVICE BULLETIN

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ORIGINAL ISSUE : JAN 21 /14

## 8AeJETSTREAIII SsritiS

### 4"J(J SERVICE BULLETIN 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- 10-18 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

## IIAeJETSTREAM Ssrit1s4'00 SERVICE BULLETIN 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 

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SHORT STOP ARM 

# 0

EARLY PRODUCTION STOP PLATE 14127025-51 

### STOP PLATES FIGURE 1 LONG STOP ARM 

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LATER PRODUCTION STOP PLATE 14127025-51



### ORIGINAL ISSUE : JAN 21 /1 4 27-35-1 0019

J41-27-068 

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ORIGINAL ISSUE : JAN 21 /14

### 3. MATERIAL INFORMATION A. 

### New parts supplied Not applicable. 

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### B. Replacement Parts - Operators Supply Not applicable
. C. Instruction Dispositions Notes Not applicable
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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
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ORIGINAL ISSUE : JAN 21 /14 J41 -27-068 

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ORIGINAL ISSUE: JAN 21/14

## BAE SYSTEMS 

## ACCOMPUSHMENTREPORT 

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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 APPROPR IATE REVISIONS TO APPLICABLE MANUALS
. NAME: ............................. ............................ .. .......... ............. SIGNED : .... ..... ...... ..... ....................... ...... ........ ... ................... COMPANY: .. .. ..................... ................................................. DATE: ................. .. ............................................................... SERVICE BULLETIN COMMENTS/FEE DBACK Please report any non-technical comments or inaccuracies regarding this service bulletin to the above address.