### BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT TRANSMITTAL FOR INSPECTION SERVICE BULLETIN REVISION SERVICE BULLETIN No.ISB. 53-239 DATE: 13-JUN-2012 TITLE: FUSELAGE
- INSPECTION OF REAR FUSELAGE AFT SKIN LAP JOINTS FOR CRACKING. REVISION: 3 DATE: 07-MAY-2014 ACTIONS (1) Remove and discard Inspection Service Bulletin complete at revision 2. (2) Insert Inspection Service Bulletin complete at revision 3. REASONS FOR REVISION (1) Areas not to be inspected clarified for aircraft with Large freight doors (see para.1.C and para.2.C.(1)). (2) EASA Airworthiness Directive reference added (see para.1 .D). (3) Editorial. INCORPORATION OF THIS REVISION DOES NOT REQUIRE INSPECTIONS ADDITIONAL TO THOSE DONE AT PREVIOUS REVISIONS OF THIS INSPECTION SERVICE BULLETIN.

Date: 13-JUN-2012 REVISION TRANSMITTAL SHEET ISB. 53-239 Revision: 3 07-MAY-2014 Page 1of2 Printed in England

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT TRANSMITTAL FOR INSPECTION SERVICE BULLETIN REVISION SERVICE BULLETIN No.ISB. 53-239

This Page Is Intentionally Left Blank.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### REVISION TRANSMITTAL SHEET ISB. 53-239 Page2of2BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT TITLE: FUSELAGE - INSPECTION OF REAR FUSELAGE AFT SKIN LAP JOINTS FOR CRACKING. 1.Planning information A.Effectivity (1) Aircraft Aircraft affected by this inspection are defined below:- BAe 146-301 All BAe 146-100, 200, 300 Series All AVRO 146-RJ70, RJ85, RJ100 Series Check the aircraft technical records for accomplishment of this inspection before actioning this Inspection Service Bulletin (ISB). B.Reason During climb-out, an AVRO 146-RJ100 recently experienced pressurization problems. Subsequent investigation identified a 42.87 in. (1089 mm.) Long crack in the rear fuselage aft Lower skin at the Lap joint at stringer 30 Left. In addition to the skin crack, cracks were found in Frames 41X and 42. Existing fatigue inspections of the fuselage skin may not detect a crack growing in this area, which could affect the structural integrity of the rear fuselage. Consequently, fleet wide inspection of the rear fuselage skin Lap joints is required. C.Description An external eddy current inspection is performed on the rear fuselage aft skin Lap joints at stringers 11, 18 and 30 Left and right and stringer 2 right, between frame 39Y and frame 44. Inspection aft of frame 44 is not required. NOTE: There may be external skin repair plates fitted to the aircraft which obscure the areas subject to inspection or impede the inspection process. These areas are not to be inspected but must be reported to BAE SYSTEMS using the reporting form provided in Appendix 1 of this ISB.
Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page1of12

# I BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT NOTE: For BAe 146-100, BAe 146-200 and BAe 146-300 aircraft with Large freight doors, Lap joints 11 and 18 Left forward of frame 43, and Lap joint 2 right forward of frame 42, are obscured by the Large freight door surround skin doublers. These areas are not to be inspected (see Drawing 2). If cracks, corrosion or any other defects are found, contact BAE SYSTEMS for an approved repair scheme. D.Compliance This ISB, at Revision 2, is the subject of EASA Airworthiness Directive 2013-0207. Compliance with this ISB, at Revision 3, is to be in accordance with the table below:- Table 1. Skin Land Initial Inspection, Repeat Interval, Repeat Interval, All Aircraft RJ Delta PAircraft 146 and RJ Pre Delta (Mod HCM50070E or F PAircraft (Pre-Mod or HCM50259A) HCM50070E or For Pre-Mod HCM50259A) Stringer 30, Left 10,000 FC 4,000 FC 7,500 FC and Right Stringer 2, Right 10,000 FC 4,000 FC 7,500 FC Stringer 11, Left 10,000 FC 4,000 FC 7,500 FC and Right Stringer 18, Left 10,000 FC 4,000 FC 7,500 FC and Right NOTE: FC is defined as Flight Cycles. For aircraft that have accumulated more than 9000 Flight Cycles since entry into service, initial inspection is to be within 1000 Flight Cycles or 6 months, whichever is earlier. Inspections previously performed in accordance with this ISB at initial issue or EASA AMOC 10041592 may be claimed, but only as the initial inspections for the skin Lands at Stringer 30 Left and Stringer 30 Right. Thereafter, all Stringers are to be inspected at the repeat intervals specified in the table. E.Approval The technical information contained in this document has been approved under the authority of EASA Part 21 Approval No. EASA.21J.047. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page2of12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT F.Manpower To inspect as defined in para. 2 - 8.0 man-hours per aircraft. This man-hour estimate does not include time for gaining access to the inspection area. G.Materials- cost and availability Not applicable. H.Tooling- cost and availability Appropriate staging/access platforms are required to allow close inspection of all the rear fuselage aft skin Lap joints. Refer to Appendix 2, EQUIPMENT AND MATERIALS. !.Weight and balance Not applicable. J.References Aircraft Maintenance Manual AMM 12-10-24. K.Publications affected Not applicable. L.Electrical Load data Not applicable. M.Software accomplishment summary Not applicable. N.Aircraft noise Levels Not applicable.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page3of12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

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Date: 13-JUN-2012 ISB. 53-239 Revision: 3 07-MAY-2014 Page4of 12 Printed in England

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 2.Accomplishment instructions A.General (1) The following abbreviations are used within this document:- AMM -Aircraft Maintenance Manual (2) Observe all WARNINGS and CAUTIONS appearing in the AMM referred to in this Service Bulletin. B.Preparation (1) Refer to AMM 12-10-24 and remove all aircraft electrical power. (2) Arrange appropriate staging/access platforms to allow safe inspection of all the rear fuselage aft skin Lap joints. (3) Remove dorsal panels 273CT, 275AT, 275BR and 275CR to reveal lap joint at stringer 2 right. C.Inspection (1) Refer to Drawing 1 or Drawing 2, as appropriate, and Appendix 2. Perform an external eddy current inspection on the rear fuselage aft skin lap joints at stringer 11, 18 and 30 left and right and stringer 2 right, between frame 39Y and frame 44. NOTE: Inspection aft of frame 44 is not required. NOTE: There may be external skin repair plates fitted to the aircraft which obscure the areas subject to inspection or impede the inspection process. These areas are not to be inspected but must be reported to BAE SYSTEMS using the reporting form provided in Appendix 1 of this ISB. NOTE: For BAe 146-100, BAe 146-200 and BAe 146-300 aircraft with large freight doors, lap joints 11 and 18 left forward of frame 43, and lap joint 2 right forward of frame 42, are obscured by the Large freight door surround skin doublers. These areas are not to be inspected (see Drawing 2). (2) If cracks, corrosion or any other defects are found, contact BAE SYSTEMS for an appropriate repair scheme. D.Test Not applicable. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page5of12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT E.Close up (1) Make certain work area is clean, and clear of tools and miscellaneous equipment. (2) Install dorsal panels previously removed for access. (3) Remove staging/access platforms previously arranged for access. F.Documentation (1) Complete a copy of the Inspection Report (Appendix 1) attached to this ISB and return by fax or mail. OR Return all required Inspection Report details via e-mail. G.Terminating action (1) None.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page6of12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

FRAME

43 FRAME 

## I FRAME

44 39Y

I 

## I

**STR2 b-~----~~==========~**  STR 11 RH- FRAME 

# 0000 

# DODO FRAME 39Y

I



## ~ VIEWLOOKING INBOARD LEFTSIDE STR 11 RH 43 1 FRAME 44



## I STR 18 RH- STR 30 RH-

- STR 11 LH

- STR 18LH

- STR30LH

STR2

VIEWLOOKINGAFT 

# 0

VIEWLOOKING INBOARD RIGHTSIDE

--- LAPJOINTSTO BE INSPECTED 

# ¢Jc

N5323902 

### AREAS OF INSPECTION, LEFT AND RIGHT - PASSENGER AIRCRAFT DRAWING 1. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page7of12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

FRAME FRAME

43 39Y 44 42 FRAME I FRAME I I

**STR2RH ~~~P===9=============~** 

FRAME FRAME

39Y

I 43 1 FRAME 44

I ,-------- I-- 1--

D'--------' 

# 0

**~** 

## [!] VIEWLOOKING INBOARD LEFTSIDE t-- 1--

**~**

--- LAPJOINTSTO BE INSPECTED - STR 11 LH

- STR 18 LH 

# 0

VIEWLOOKING INBOARD RIGHTSIDE

STR 2RH

VIEWLOOKINGAFT 

# Qc

N5323907 

### AREAS OF INSPECTION, LEFT AND RIGHT - AIRCRAFT WITH LARGE FREIGHT DOOR DRAWING 2. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page8of12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 3.Material information None.

Date: 13-JUN-2012 ISB. 53-239 Revision: 3 07-MAY-2014 Page9of 12 Printed in England

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

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Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page 10of 12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 

### APPENDIX 1 1.INSPECTION REPORT A.Complete and return this form as detailed OPERATOR: AIRCRAFT REGISTRATION: CONSTRUCTORS NUMBER: FLIGHT HOURS: LANDINGS: DATE INSPECTION PERFORMED: FINDINGS:

To: Customer Technical Support (Building 37), BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, 

### KA9 2RW, Scotland. Fax + 44 (Q) 1292 675432 e-mail raengliaison@ baesystems.com



### Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page 11 of 12

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

This Page Is Intentionally Left Blank.

Date: 13-JUN-2012 ISB. 53-239 Revision: 3 07-MAY-2014 Page 12 of 12 Printed in England

### BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT TRANSMITTAL FOR INSPECTION SERVICE BULLETIN REVISION SERVICE BULLETIN No.ISB. 53-239 

### APPENDIX 2 DATE: 13-JUN-2012 TITLE: EXTERNAL EDDY CURRENT INSPECTION INSTRUCTION FOR THE EXAMINATION OF THE REAR FUSELAGE AFT SKIN LAP JOINTS. REVISION: 3 DATE: 07-MAY-2014 ACTIONS (1) Remove and discard appendix complete at revision 2. (2) Insert appendix complete at revision 3. REASON FOR REVISION (1) There are no changes to this Inspection Instruction as a result of ISB 53-239 revision 3.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### REVISION TRANSMITTAL SHEET ISB. 53-239 Page1of2

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT TRANSMITTAL FOR INSPECTION SERVICE BULLETIN REVISION SERVICE BULLETIN No.ISB. 53-239

This Page Is Intentionally Left Blank.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### REVISION TRANSMITTAL SHEET ISB. 53-239 Page2of2BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland. INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 

### APPENDIX 2 TITLE: EXTERNAL EDDY CURRENT INSPECTION INSTRUCTION FOR THE EXAMINATION OF THE REAR FUSELAGE AFT SKIN LAP JOINTS. 1.PROCEDURE A.GENERAL (1) This Low frequency, phase analysis, external eddy current inspection instruction has been produced to detect cracks in the rear fuselage aft skin Lap joints. B.COMPONENT OR AREA TO BE INSPECTED (1) The components to be inspected are the rear fuselage aft skin Lap joints at stringers 11, 18 and 30 Left and right and stringer 2 right, between frame 39Y and frame 44 (see Drawing 1 or Drawing 2, as appropriate). C.DESCRIPTION OF POSSIBLE DAMAGE (1) Cracks 0.5 in. (12.7 mm.) or greater in Length that Lie 0.016 in. (0.41 mm.) or Less below the surface of the skin panels at the skin Lands. It is anticipated that cracks will originate in, and propagate along, the rebate which forms the skin Land. D.RELATED DOCUMENTS (1) NTM Part 1, Chapter 20-00-00, Section 3, Safety Precautions. (2) NTM Part 6, Chapter 20-00-00, Eddy Current Testing
- General. (3) Aircraft Maintenance Manual (AMM). (4) Test Instrument Manufacturer's Handbook. E.EQUIPMENT AND MATERIALS (1) The following equipment was used during the development of this inspection instruction and was found acceptable. ( 1 ) Instrument (2) Probe

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Table 1. Elotest B1v4 phase analysis eddy current instrument, with 81-RS adapter, from Rohmann (UK) Ltd. Absolute shielded probe with ferrite core, 300 Hz. - 100 kHz. Part number PKA 42-9E, from Rohmann (UK) Ltd (Ref. Drawing 4).

Printed in England ISB. 53-239 Page1of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT (3) (4) (5) Lead Reference Standard Straight edge 

### APPENDIX 2 Part number EK-2-HF/1, from Rohmann (UK) Ltd. Locally manufactured. Part number SORFIT 146/166/1 (Ref. Drawing and Drawing 6). Locally manufacture from suitable non-conductive material such as plastic or nylon. NOTE: Reference Standard SORFIT, 146/166 may be used for this inspection provided SLOT A2 ONLY is used when setting sensitivity. Slots A1, B1 and B2 were included for development purposes and should not be used for this inspection. NOTE: Any comparable eddy current equipment may be used provided it satisfies the requirements of this instruction and is capable of resolving the slot in the reference standard at the required Level of sensitivity. F.PREPARATION FOR INSPECTION (1) Aircraft. (a) Ensure adequate staging/access platforms are in place to provide safe access to the inspection areas. (b) Remove dorsal panels 273CT, 275AT, 275BR and 275CR to uncover Lap joint at stringer 2. <2> Component. (a) Ensure scan surfaces are clean, smooth (flatten sealant if protruding) and free from flaking paint. (b) Check the inspection areas for any visible damage prior to inspection. G.INSTRUMENT CALIBRATION (1) Instrument settings. Initial settings Alarm Frequency
Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Table 2. Refer to manufacturers instructions. Optional
- refer to manufacturers instructions. Inspection Frequency Set to 10 kHz.

Printed in England ISB. 53-239 Page2of14Gain 

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT Set to produce required sensitivity. Pre-amp 

### Yspread Xspread 0 dB. 20 dB. 0 dB. 

### APPENDIX 2

F

ilter: Band Set to Static.
Bandwidth limiter Timebase/Display Dot position High pass Low pass Set to Off. 

### Y/X. Reference Drawing 4. (2) Sensitivity setting (Ref. Drawing 4). Set to Off. Set to 10 Hz.

(a) Place the probe on the reference standard away from the sub-surface slot and balance the instrument. (b) Set Lift-off effect to horizontal and to the Left. (c) Slide the probe over the sub-surface slot and note the response. Adjust the instrument settings to obtain a display similar to that shown in Drawing 4. Ensure that the slot produces a positive vertical spot displacement of 50 percent of FSH. H.INSPECTION PROCEDURE (Ref. Drawing 1 or Drawing 2, as appropriate, and Drawing 3). (1) Inspection method. (a) Place the probe on the fuselage outer skin centrally over the skin Land gap and balance the instrument. NOTE: Care should be taken when balancing the instrument. The effect of balancing on a defect will cause the slot to move more rapidly downwards when the end of the crack has been reached. If in doubt, the balance can be checked on a different skin Land. (b) Adjust Lift-off as required. (c) Scan along the skin land gap, using the straight edge to keep the probe central and observe all signal responses. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page3of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 

### APPENDIX 2 (d) Scan the skin along the Lands at the rear fuselage aft skin Lap joints at stringers 11, 18 and 30 Left and right and stringer 2 right. I.ACCEPTANCE CRITERIA (1) Interpretation. (a) Cracks are indicated by a rapid vertical spot displacement away from the balanced position (Ref. Drawing 3). NOTE: Cracks and other discrete surface damage are usually identified by a rapid positive vertical spot displacement away from the balanced position. However, once the crack or damage is passed the spot returns to the balanced position. NOTE: Smooth, gradual spot movement is a common occurrence, which happens for a variety of reasons such as paint thickness variation (Lift-off), edge effect and conductivity changes. (2) Accept/Reject criteria. (a) Any indication with a rapid vertical spot displacement equal to or greater than 20 percent of FSH height that cannot be attributed to probe handling, fasteners or component geometry shall be considered as a crack. (3) Reporting/repair/rectification. (a) ALL crack and discontinuity indications are to be recorded in the relevant aircraft documentation and the appropriate BAE SYSTEMS approved repair/rectification action taken. NOTE: The word discontinuity is a generic term for faults such as cracks, corrosion and mechanical damage. J.REPORTING PROCEDURE (1) Report all cracks/discontinuities to:- Fleet Data Department (Building 37), BAE SYSTEMS (Operations) Limited, Prestwick International Airport, Ayrshire, Scotland, KA9 2RW.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page4of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 

### APPENDIX 2 (2) Also send the following information:- (a) Aircraft constructor's number. (b) Aircraft registration. (c) Flying hours and number of Landings. (d) SSID number. (e) Location/area or Length of the crack or discontinuity/per cent FSH. K.ADDITIONAL INFORMATION (1) Ensure all test equipment is removed from the aircraft on completion of work.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England ISB. 53-239 Page5of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

FRAME

43 FRAME FRAME

44 39Y

I 

## I STR
**~-*'==-f======~** STR 11 RH- 

### APPENDIX 2

FRAME 

# DODD Qc 

# DODD FRAME 39Y



## I



## ~ VIEWLOOKING INBOARD LEFTSIDE STR 11 RH 43 1 FRAME 44



## I

- STR 11 LH

- STR 18LH

- STR30LH



## [f) VIEWLOOKINGAFT 

# 0

VIEWLOOKING INBOARD RIGHTSIDE

--- LAPJOINTSTO BE INSPECTED

N5323902 

### LOCATION OF INSPECTION AREAS, LEFT AND RIGHT - PASSENGER AIRCRAFT DRAWING 1. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page6of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 

### APPENDIX 2

FRAME FRAME

43 39Y 44 42 FRAME IFRAME I I

**STR2RH b-~~====~============~** 

FRAME FRAME

39Y



## I 43 1 FRAME 44



## I ,-----. r---

**~**

0 '----' 

## f)

.......



## ~ VIEWLOOKING INBOARD LEFTSIDE 

### r--


# -

**~**

--- LAPJOINTSTO BE INSPECTED - STR 11 LH

- STR 18LH

- STR30 LH STR 11 RH

**~** 

# 0

VIEWLOOKING INBOARD RIGHTSIDE

STR2 RH



## @] VIEWLOOKINGAFT 

# Qc

N5323907 

### LOCATION OF INSPECTION AREAS, LEFT AND RIGHT - AIRCRAFT WITH LARGE FREIGHT DOOR Date: 13-JUN-2012 Revision: 3 07-MAY-2014 DRAWING 2.
Printed in England 

### ISB. 53-239 Page7of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

EXPECTASMALLINDICATION DUETO FASTENERS FALLINGCLOSETOTHE SKIN LANDGAP (THIS IS LIKELYATCERTAIN FRAME POSITIONS)



## -----------r------------ **------~**

**E~** STRAIGHTEDGE SCANALONGTHESKIN LANDGAPUSINGTHE STRAIGHTEDGEAS A PROBEGUIDE FUSELAGE OUTERSKIN

TYPICAL STRINGER30SHOWN



### PROBE POSITIONING AND SCAN DETAILS DRAWING 3. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England LAP JOINT 

### APPENDIX 2

ETCHED REBATE

SECTION 'E-E'

N5323903 

### ISB. 53-239

Page8of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 

### APPENDIX 2
SIGNALFROM SUB-SURFACE SLOT-50% F.S.H. 75%FSH


### r-~~-,---.---.---.---,---,---,--,

**r/** ___, 

# _____j ______l_____j_____

### _L__________

## l_____l____ 

## .~

**_l_**

## . __j

______ 50% FSH
25% FSH I I I I I I 1 I I I I I I I I I I I I I I I I I I I I 1 1 I I I I I I I I -----+-----t--

**----~-----~**------ ------:----

**--~-** ---

**~------+---** --- 1 I I I I I t I I I I I I I I I I I I I I I I I I I I I I I I I ------:------r

**-----~ ----** --r----- -----

**-~---**--t----- ------t------ , I I I I I I I I I I I I I I I I I I I I I I I I I 1 I ' ' ' ' ' ' ------:---

**---~----** --

**~---- -~------**  -----

**~------~-----** ---

**--~--** ---- 1 I I I I I I I I I I I I 1 1 I I I I I I 1 I

**-----+-----~-- ---+-----~-----**  **------~-=H---1----- I-----~------**  1 I I I I I I I I I I I I I ' ' ' / t·----+-----t------r-----1----- 

### -----i------r-----1------r------

, I I I I 1 I I I I I I I t I I I I I I I 1 I I LIFTOFF 1 t 1 t 1 r t t
PROBE IN SUB-SURFACE SLOTPOSITION TYPICALELOTESTB1 v4 SCREEN DISPLAY FOR SUB-SURFACESLOTIN REFERENCESTANDARD 'X' INDICATES BALANCE POSITION

BALANCE POSITION 

# I PROBE IN



## ~ 

# 0

SORFIT146/166/1 0.79in (20mm) 

# 1 · ·1 0

E' E

**~**

**~** c: iij <Xl 0 

## -.-----------,----/ ' '

SUB-SURFACE SLOT 

# 0

PKA 42-9E

**~fl** 0.4in (10mm) DIA. PROBE FACE MANUFACTURER: ROHMANN (UK) LTD TYPE: ABSOLUTE FERRITE CORE (SHIELDED) PARTNUMBER: PKA42-9E FREQUENCY RANGE: 300Hz-100kHz CONNECTOR: FISCHER4PIN 

### INSTRUMENT CALIBRATION AND PROBE DETAILS DRAWING 4. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England N5323904 

### ISB. 53-239

Page9of14' 

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

4.0in 

# CF I (1 01 .6mm) 1 ---------


# - I



# J-------------t---------~ 1.00in (25.4mm) 0.068in G 

## I '==========l 

## I (1.7.mm)0.432in G (10.97mm) '

.

## -f----~**-I------~ ·.~-!-----8** 



# 1 0.50on (12.7mm) 1 

# I 1 -f-----1----



### G)- **--~- -@**  

## I 0.50in 1 1 1 

## I o (12.?mm) SORFIT1146/166 /1 

# I I 

# b I 

# 1.. ..1.. ..\.. 

# ..j.. 

# !\ .. ..\ .. ..1 0.50in 0.75in " 0.50in (12.7mm) (19.05mm) (12.7mm) PITCH 

## f-----]---{-------

## j---{--------}--{-------}--

# -t-------j---{----

## -j SECTION'G-G'

1. 1NNERSKIN 2. OUTER SKIN 3.FASTENERS

BS L166 BS L166 0.126in (3.2mm) 0.058in (1 .47mm)

MACHINED RIVET EQUIVALENTMATERIALSPECIFICATION 4070-40-10 INTERNATIONALDESIGNATION 5 POSITIONS 2014A-T4 

## I 2014A-T4 ALCLAD ALCLAD 2.50in (63.5mm) 

### APPENDIX 2

2 SECTION'F-F'

FOR FASTENER INFORMATIONAND IDENTIFICATION REFERTOSTRUCTURALREPAIR MANUAL51-41-00. FOR DRILLINGANDCOUNTERSINKING INFORMATION REFERTOSTRUCTURAL REPAIR MANUAL51-42-00. UNLESS STATEDOTHERWISE DIMENSIONALTOLERANCE IS +/-0.010in.(0.25mm). THEAPPLICATIONOF SURFACE PROTECTION IS OPTIONAL. THE REFERENCESTANDARDDOES NOTREQUIREANYJOINTINGCOMPOUNDS. MARK REFERENCE NUMBERONTOP SURFACE INAPERMANENTMANNER. N5323905 

### CALIBRATION STANDARD PART NUMBER SORFIT 146/166/1
- MATERIAL DETAILS DRAWING 5. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page 10of 14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

1.. 1.75in (44.45mm) 0.50in (12.7mm) 

# ...1 .. ...1.. 

# I I I I 

# I I I I 1.75in (44.45mm) 

# H¢ 1------J



## -'**~;;;;;;..t~::.=------------1** 

# 0 0 0 0 0
_l 0.068in 0.058in 0.068in 

# --t(1.73mm) (1.47mm) (1.73mm) RAD SLOT 

## [BJ 

# QJ APPENDIX 2

SLOT



# /2 

# 0 

# 0 0 0 0 SORFIT 146/166/1 ONE SLOTIN ITEM 1=0.5in (12.7mm) LONG SLOTIS SUB-SURFACE MAXIMUMSLOTWIDTH0.010in (0.25mm) NOSLOTS IN ITEM 2 DIMENSIONALTOLERANCE+/-0.010in (0.25mm) N5323906 

### CALIBRATION STANDARD PART NUMBER SORFIT 146/166/1
- SLOT DETAILS DRAWING 6. Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### ISB. 53-239 Page 11 of 14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 2.ACCOMPLISHMENT INSTRUCTIONS Not applicable.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### APPENDIX 2

ISB. 53-239 Page 12 of 14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT 3.MATERIAL INFORMATION Not applicable.

Date: 13-JUN-2012 Revision: 3 07-MAY-2014 Printed in England 

### APPENDIX 2

ISB. 53-239 Page13of14

## BAE SYSTEMS INSPECTION SERVICE BULLETIN BAe 146 SERIES/AVRO 146-RJ SERIES AIRCRAFT

This Page Is Intentionally Left Blank.

Date: 13-JUN-2012 ISB. 53-239 Revision: 3 07-MAY-2014 Page 14 of 14 Printed in England