BAE Systems Inspection Service Bulletin J41-24-043: Revision 3, text

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BAe JETSTREAM Series 4100

SERVICE BULLETIN

BAE SYSTEMS (OPERATIONS) LIMITED,

PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND.

J41-24-043

TRANSMITTAL SHEET This page transmits revision 3 of service bulletin J41-24-043, pages 1 to 20.

TITLE: ELECTRICAL POWER - DO GENERATION - OVERHEAT FAILURE OF EARTH POSTS (LEFT AND RIGHT).

INSPECTION Actions

(1) Remove and discard service bulletin at revision 2.

(2) Insert Service Bulletin at revision 3.

Reasons for Revision

(1) Para.2.B.(2). (e) Accomplishment - Torque value changed to 200 Ibf.in. (22.6 Nm.)

(2) Para.2.C.(1). Recovery - Installation of fairings added.

INCORPORATION OF THIS REVISION DOES NOT REQUIRE REWORK OF THE MODIFICATION(S) EMBODIED BY EARLIER REVISIONS OF THIS SERVICE BULLETIN.

ORIGINAL ISSUE: SEP 27/11 J41-24-043 Revision 3: 16th June 2014 PAGE 1 OF 1

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BAe JETSTREAM Series 4100

SERVICE BULLETIN

BAE SYSTEMS (OPERATIONS) LIMITED,

PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND.

J41-24-043 MILE: ELECTRICAL POWER - DC GENERATION - OVERHEAT FAILURE OF EARTH POSTS (LEFT AND RIGHT)

INSPECTION BULLETIN

PLANNING INFORMATION A. Effectivity All Jetstream Series 4100 Aircraft.

B. Reason An operator has reported an incident involving an overheat failure of the bracket on which is located the earth post for the generator and propeller de-ice systems. Although the earth post and cables were not damaged, the mounting bracket and underlying structure was damaged and needed to be replaced or repaired.

This Service Bulletin is to make sure there are no signs of corrosion or damage to the aircraft structure on or around the bracket, that the earth posts are secure and that the electrical performance of each earth post is within specified limits.

C. Description This Service Bulletin calls for an inspection of the earth post EP2 (Left) and earth post EP4 (Right) on the structure for the Left and Right power plants.

The tasks are as follows:

- Fairing panels are removed.

- Inspect for signs of arcing and lateral movement of the earth post.

- A high-current millivolts-drop test is done between each earth post and the main wing

- The panels are installed.

- The aircraft records are amended.

D. Manpower

4.0 man-hours.

Electrical skills are necessary.

ORIGINAL ISSUE: SEP 27/11 J41-24-043 Revision 3: 16th June 2014 PAGE 1 of 20

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BAe JETSTREAM Series 4100

SERVICE BULLETIN E. Material - Cost and Availability Not applicable.

F. Tooling - Price and Availability Refer to AMM Subtask 20-21-00-760-004.

ITEM 20-0002 Ammeter, 150 amp.

ITEM 20-0007 Millivolt meter.

ITEM 20-0009 Variable power-supply unit, 150 amp.

Alternatively, use the following commercially available equipment or equivalent.

Megger MOM2 High current hand held micro-ohmmeter.

G. Weight and Balance None.

Aircraft Noise Levels Aircraft noise is not affected.

Electrical Load Data Not affected.

Software Accomplishment Summary Not applicable.

K. References

- Aircraft Maintenance Manual (AMM). Chapters 06, 12, 20 and 71.

- Structural Repair Manual (SRM). Chapter 51.

Publications Affected None.

J41-24-043 ORIGINAL ISSUE: SEP 27/11 PAGE 2 Revision 3: 16th June 2014

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BAe JETSTREAM Series 4100

SERVICE BULLETIN M. Family Tree Of Modification Relationships Not applicable.

N. Approval BAE SYSTEMS recommends that this service bulletin is accomplished within 12 months of the original issue date of this service bulletin.

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

The technical content of this service bulletin is approved under the authority of EASA PART 21 Approval No. EASA.21J.047.

Signed Date ....

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

ORIGINAL ISSUE: SEP 27/11 J41-24-043 Revision 3: 16t June 2014 PAGE 3

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BAO JET STE: 4100

SERVICE BULLETIN

BLANK PAGE J41-24-043 PAGE 4 ORIGINAL ISSUE: SEP 27/1 Revision 3: 16th June 201

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BAe JETSTREAM Series 4100

SERVICE BULLETIN

2. ACCOMPLISHMENT INSTRUCTIONS WARNING: MAKE SURE THE AIRCRAFT AND THE AIRCRAFT SYSTEMS ARE MADE

SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFT MAINTENANCE MANUAL.

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

AMM - Aircraft Maintenance Manual.

SRM - Structural Repair Manual.

A. Preparation

(7) Refer to AMM, Chapter 12-00-00. Remove all aircraft electrical power.

(2) Display a warning notice in the flight compartment 'DO NOT APPLY

POWER TO THE AIRCRAFT Accomplishment - Left and Right - Information in brackets is applicable to the Right installation.

(1) Refer to the AMM Chapters 06 and 71. Remove the inboard fairing panel 414AR from the left engine and the outboard fairing panel 424AR from the right engine.

(2) Refer to Figure 1 and the SRM Chapter 51. Look for defects and take actions as follows:

Inspect the structure around the earth post EP2 (EP4) and the mounting bracket to which it is attached. Look for damage caused by arcing or signs that the structure has been overheated. Also look for a colour change of the protective treatments on the structure. No lateral movement of the earth post is permissible.

Examine the attachment of the nacelle horizontal support on the same mounting bracket. Look for damage caused by arcing or signs that the linkage has been overheated.

Report all findings of damage to:- Repair Drawing Office, BAE Systems (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland.

Give the aircraft tail number, flying hours and details of the damage.

Request a repair scheme.

(d) Inspect the earth cables for the generator and propeller de-ice systems. Look for signs that the cable insulation has been overheated.

Look for arcing damage or signs that the terminal tags have been ORIGINAL ISSUE: SEP 27/11 J41-24-043 Revision 3: 16th June 2014 PAGE 5

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BAe JETSTREAM Series 4100

SERVICE BULLETIN overheated. Replace damaged cables and retest systems affected as appropriate.

(e) Check torque load of the earth post stiff nut to 200 Ibf.in. (22.6 Nm.)

Refer to the procedure in Appendix 3 for the high-current millivolt-drop test.

Alternatively, use a high current micro-ohmmeter such as a Megger MOM2 or equivalent and follow the manufacturer's instructions for high current measurements.

(a) Do a high-current millivolts-drop test for the earth bolt EP2 (EP4) using a nominal test current of 100 amp.

EITHER Measure the resistance between the earth bolt and the adjacent primary structure. The resistance must not be greater than 200 micro-ohms.

OR 2 Measure the resistance between the earth bolt and the bracket, and measure the resistance between the bracket and the adjacent primary structure. The resistance for each measurement must not be greater than 100 micro-ohms If any resistance measurement is found to be in excess of the quoted limits, then steps must be taken to investigate the source of the high resistance and to clean all the surfaces to achieve the requisite resistance value before rurther flight.

Complete the record sheets attached to this bulletin in Appendices 1 and 2, and send the results to BAE Systems at the address shown.

C. Hecovery

(1) Remove all materials, tools and equipment. Make sure work area is clean.

(2) Refer to the AMM Chapters 06 and 71. Install the inboard fairing panel 414AR on the left engine and the outboard fairing panel 424AR on the right engine.

(3) Remove warning notice from the flight compartment.

(4) Restore electrical power to the aircraft.

(5) Aircraft records:

Add service bulletin number 'J41-24-043' to the aircraft records.

Operators are reminded of the necessity to inform the Business Support Team, Technical Publications, BAE SYSTEMS, Regional Aircraft, Prestwick International Airport, Ayrshire, KA9 2RW, SCOTLAND, of the accomplishment of this SB in order to obtain the necessary revisions for the affected manuals, see paragraph

1.L. Publications Affected, of this SB.

J41-24-043 ORIGINAL ISSUE: SEP 27/11 PAGE 6 Revision 3: 16h June 2014

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BAe JETSTREAM Series 4100