## BAeJETSTREAIW Se,/es4I'OO

BAE SYSTEMS, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA92RW, SCOTlANO. J41-52-064 I ,



### TRANSMITI Al SHEET
This page transmits Original IssuetoInspection Service BulletinJ41-52-064, pages 1 through 5. TITLE: DOORS -INTRODUCTION OF ULTRASONIC INSPECTION OFTHE UPPERAND

lOWER PASSENGER/CREW DOOR PIN GUIDES INSPECTION AMENDMENT NUMBERJA090540

ORIGINAL ISSUE: SEP 15/09 BA£ SYSTEMS (Operalions) Limited. Printed Inthe U.K, 

### J41-52-064 PAGE 1 OF 1

## 8AeJETSTREAJII Sedes4100 

# SERVICE BULLETIN

. . BAE SYSTEMS, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA92RW, SCOTLAND. J41-52-064 

# II
TITLE: DOORS· INTRODUCTION OF ULTRASONIC INSPECTION OF THE UPPER AND

lOWER PASSENGERICREW DOOR PIN GUIDES INSPECTION AMENDMENT NUMBER JA090540
1. PLANNING INFORMATION 

### A. Effectivity All Jetstream series 4100 aircraft. B. Reason Failure of a passenger/crew entry door lower aft pin guide plate has been identified on an in-service aircraft as a result of exfoliation corrosion. 

## c. Description This inspection service bulletin introduces an Ultrasonic NDT inspection which has been developed to allow corrosion and discontinuities to be identified on both the upper 

## and lower pin guide plates in situ with some guide blocks removed. The tasks are as follows: The passenger doors are opened. An ultrasonic inspection of the passenger door upper and lower guide plates is done. The passenger doors are closed. The aircraft records are amended.

ORIGINAL ISSUE: SEP 15/09 SAE SYSTEMS (Operations) Um/lad. Printed inthe U.K. J41-5f-064 PAGE 1 CDF15

## BAeJETSTREAIId se,ies 4rQ(J SERVICE BULLETIN D. Manpower 2.0 man-hours for NTD inspection. NOT specialist. Mechanical and electrical skills are necessary. E. Material - Cost and availability Not applicable. 

### F. Tooling - Price andAvailability Not applicable. 

### G. Weight and Balance Not affected. H. Aircraft Noise Not affected. I. Electrical Load Data Not affected. J. Software Accomplishment Summary 

### None. 

## K. References

- Aircraft maintenance manual Chapter 12-00-00. lL. Publications Affected None. M. Family Tree Of Modification Relationships Not applicable.



### J41·52-064 PAGE 2 Prinll!d In Itle U.K. ORIGINAL ISSUE: SEP 15/09

## BAeJETSTREAJII Senes4fOO SERVICE BULLETIN 

### N. Approval The technical content of this inspection service bulletin is the subject ofAirvlOrthiness Directive consultation, and is approved under the authority of Design Organisation Approval No. EASA.21J.047. This inspection is to be embodied within 12 months of the original issue date of the inspection service bulletin. Repeat inspections to be done at 4 year intervals after the original inspection.

Signed Date 

# ---

... 0'>" .



# ................ iJh/1 EASA Part 21 Approval No. EASA.21J.047.

ORIGINAL ISSUE: SEP 15/09 Prlntod Intile U.K. 

### J41-52-064 PAGE 3

### J41-52-064

PAGE 4 

## BAeJETSTREAM' Senes4'O(J SERVICE BULLETIN

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?rintad jnth••u.K. ORIGINAL ISSUE: SEP 15/09

## BAeJETSTREAAI Senes4~O(J SERVICE BULLETIN 2. ACCOMPLISHMENT INSTRUCTIONS WARNING: MAKE SURE THE AIRCRAFT AND THE AIRCRAFT SYSTEMS ARE MADEi

SAFE AS DETAILED IN THE APPLICABLE CHAPTERS OF THE AIRCRAFTI MAINTENANCE MANUAL. NOTE: Statements 'AMM' refer to the Jetstream Series 4100 Aircraft Maintenance Manual. 

### A. Preparation (1) Open the passenger doors. (2) Refer to AMM, Chapter 12-00-00. Remove all aircraft electrical power. 

### (3) Displayawarning notice intheflight compartment 'DO NOTAPPLY POWER TO THE AIRCRAFT'. B. Accomplishment (1) Refer to Appendix 1. Do an ultrasonic inspection of the passenger door upper and lower guide plates. (2) Ifthe component being inspected fails the ULTRASOUND inspection. The component is to be replaced with a serviceable component before next flight. 

### C. Aircraft Recovery (1) Remove warning noticefrom theflight compartment. (2) Close the aircraft passenger doors. (3) Aircraft records. Add Inspection Service Bulletin number 'J41-52-064' to the aircraft records. NOTE: Operators are requested to advise The Publications Control Team, Aircraft

Maintenance and Publication Services, BAE SYSTEMS, Prestwick, of the accomplishment ofthis service bulletin in order to obtain the necessary revisions for the affected manuals, see paragraph 1.K. Publications Affected, of this bulletin.

3. MATERIAL INFORMATION Not applicable_

ORIGINAL ISSUE: SEP 15/09 Printed in tho U.K. 

### J41-52-064 PAGE 5I



### J41-52-0S4 PAGiS 

## BAeJEYSTREA;!;I senes4'OO SERVICE BULLETIN

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Printed in the U.K. ORIGINAL ISSUE: SEP 15109

## 8AeJETSTREAJII Series,"(}(} SERVICE BULLETIN 4. CONTINUED AIRWORTHINESS A. Continued Airvvorthiness Instructions There are no continued ailworthiness instructions applicable to this service bulletin. 

### B. Scheduled Maintenance None. 

### C. Removal Procedures None. D. Installation Procedures None. 

### E Test Procedures None. F. Trouble Shooting None.

ORIGINAL ISSUE: SEP 15/09 Printed inth(!U.K. 

### J41-52-064 pAGE 7

### J41-52-064

PAGr 8 

## BAa

## JETSTREAilII Sedes "'fOP SERVICE BULLETIN



### BLANK PAGE

Primed;" the 0.1<:. 

### ORIGINAL ISSUE: SEP 15/09

## BAeJETSTREAAI Senes4fOO SERVICE BULLETIN 

## APPENDIX 1 PASSENGER DOOR - UPPER AND LOWER GUIDE PLATES SSI NUMBER: None 1. INSTRUCTION REFERENCE BAEIMAN/J41/ULT/3 2. SAFETY PRECAUTIONS All relevant local safety procedures must be observed. 3. PROCEDURE A. Application This instruction is applicable to Jetstream series 4100. B.



### C. Component to be Examined (Ref. Fig. 1) I (1) Passenger door, upper and lower, guide plates fitted to the forward and aft

. door frames. Purpose of Examination (1) To detect a split in a component, caused by exfoliation corrosion, flus~ with the upper surface of its base It is anticipated that a split is detected when its area is approximately 0.12 in.2 (78mm2) or greater. D. Equipment Required The following equipment was used during the development of this inspection instruction and found to be acceptable, (1) (2) (3) (4) Instrument Probe:
lead: Coupling Media: Epoch Ltfrom Olympus NOT Ltd. Krautkramer 5MHz frequency, 10mm diarpeter, 

# o degree contact probe Part number K5Ki from GE Inspection Technologies (Ref. Fig. 3). Standard lema to microdot connectors Part number lCM-74~4 from Olympus NOT ltd. Ultragel I!from Diagnostic Sonar Ltd. NOTE: Any comparable ultrasonic equipment may be used provided it satisfies the

requirements of this instruction. ORIGINAL ISSUE: SEP 15/09 Printed In the U.K.

## BAeJETSTREAJII Senes 4'00 SERVICE BULLETIN E_ Preparation Refer to the Aircraft Maintenance Manual (AMM) for preparation of the following items: 

### (1) Aircraft (a) Remove the stainless steel guides as shown in figure 1 from the upper and lower guide plates on both the forward and aft door frames. (2) Component 

### (a) Ensurethatthesurface ofthescan area isclean and smooth. (b) Visually checkthe area of inspection foranyobvious damage priorto inspection. F. Examination Procedure (1) InstrumentCalibration Table 1 Initial settings Refer to manufacturer's instructions Gain As required dB Range 

### 1.000 in. Velocity 0.2517 in/lJS (6394 

### m/s) Zero 

# o ~S Pulser Half Wave 

### + Energy Med Damping 

### 500 Transmission Pulse Echo Reject 

### 0% Angle o degrees Gates Position as shown in figure 2

Set gate 1 to trigger the alarm above gate threshold Alarm Set gate 2 to trigger the alarm below gate

threshold (2) Sensitivity Settings

---- --- - -. --'Ea)-···- ..P-ositiofl t-he-ini-tial-pulse-at-zer-o-sl1 the-tir-nebase.

(b) Place the probe on the component as shown in fig-ure 2, and set the backwall echo to 8on the timebase. (c) Adjust the instrument's gain so the amplitude of the backwall echo is 100 per cent full screen height. (d) Re~check the sensitivity setting on each door guide prior to inspection. 

### J41-52-064 PAGf 10 Printed in the UK ORIGINAL ISSUE: SEP 15109

### BAeJETSTREAJII 

## Se,;es 4~IJO SERVICE BULLETIN 

### (3) Inspection Procedure (a) Placethe probe onthesurface ofthecomponentwithin the areaof inspection and scan the hatched area shown in figure 2_ 

### (b) Monitor the amplitude of the backwall echo at 8 on the timebase, and also look for possible fault indications at approximately 6 on the timebas8. (e) Ensure that the upper and lower guide plates on the forward and aft door frames are inspected. 

### NOTE: Asthe probe isscanned across the cross drilled holes the backwall echo will

reduce belowthe alarmtriggerthreshold. This is notafault indication. G. Interpretation 

### (1) A split in the component caused by exfoliation corrosion is likely to occur flush with the upper surface of its base. This will cause a decrease in the 

### backwa!l echo. It may also produce afault signal at approximately 6 Qnthe timebase. H. Accept IReject Criteria (Ref. Fig.3) (1) The following shall beconsidered asevidence ofexfoliation corrosion: (a) Any decrease inthe backwaJlecho below60 percentfull screen height. 

### (b) Anyfaultsignal above 10percentfull screen height. (c) Ifevidence ofexfoliation corrosion isfound insteps (a)or(b).Then the component being inspected isto bereplaced with aserviceable component before nextflight. 1. Examination Standard (1)
NOTE: 

### All corrosion and discontinuity indications are to be recorded in the relevant

aircraft documentation andthe appropriate BAE SYSTEMS approved rJpair I rectification taken. I 

### The word discontinuity is a generic term for faults such as cracks, corrosion and mechanical damage. J. Reporting Procedure (1) Report allcracks Idiscontinuities to: Fleet Data Department (Building 37) BAE SYSTEMS 

### Regional Aircraft Prestwick Intemational Airport Ayrshire Scotland KA9 2RW.

ORIGINAL ISSUE: SEP 15109 Printed inthe U.K. 

### J41-52-064 PAGE 11

## 8AeJETSTREAIW Sene,54TOO SERVICE BULLETIN 

### (2) Alsosendthefollowinginformation: (a) Aircraftconstructionnumber (b) Aircraftregistration (c) Flyinghoursandnumberoflandings (d) SBnumber (e) Location 

### Iarea or length ofthe crack or discontinuity j per cent FSH.
K. Additional Information 

### (1) Ensurealltest equipmentis removedfromtheaircrafton completion of work.

ORIGINAL ISSUE: SEP 15/09 Prinl"d in the U.K.

## 8AeJETSTREA_ Senes 4fOtJ SERVICE BULLETIN

eoM"" / STNNLESS STEEL GUICE

# ----l
UPPER GUIDE PLAT,E



# """" STAINLESS STEEL GUIDE

FLOOR LEVEL LOWER GUIDE PL.ATE

GUIDE PLATES FinED TO AFT DOOR FRAME SHOWN GUIDE PLATES FinED TO FORWARD DOOR FRAME ARE SIMIL.AR
Location of Passenger Door Upper and Lower Guide Plates Figure 1 

### ORIGINAL ISSUE: SEP 15/09 Printed 1"the U.K. 

### J41-5~-064 PAGE 13

## BAeJETSTREAJIB Se,ies 4fOtJ SERVICE BULLETIN

CROSS DRILLED -HOLES

POSITION PROBE ATTHIS POINT TOSET8ACKWALLECHO

LOWER GUIDE PLATE UPPER GUIDE PLATE



### J41-52-064 PAGE 14 

# I GUIDE PLATES FITTED TOAFT DOOR FRAME SHOWN GUIDE PLATES FITTED TO FORWARD DOOR FRAME ARE SIMILAR Scan Areas - Upper and Lower Guide Plates

Figure 2 ORIGINAL ISSUE: SEP 15/09 Printed in the UK

## BAeJETSTREAJII Senes 4100 SERVICE BULLETIN

lYPlCAL EXFQlAiJ(rIl CQRROSlON EO<} 

# I BACKWAll ECHO



### -



# ••••• 

# " L 

# l1lIL "Xl
80
60
40
20


### o o 2 3 

# • 5 6 7 

# • 9 10 GATE 2THRESHOLD SETAT60 PERCENT FULL SCREEN HEIGHT

GATE 1 THRESHOLD SETAT 10PERCENT FULLSCREEN HEIGHT

0.35" (9119119) 

# I I 0.43"

(11rrm) 

# rl ~=r 

# U 0.31"' (8mm)

0.39" (1Orrm) Krautkramer 5MHz, 0 degree contact probe Part number K5K from GE lnsoectian T

### ypicaJ Screen Display and Ultrasonic Probe

Figure 3 ORIGINAL ISSUE: SEP 15/09 Printed in !he U.K. 

### J41-52-064 PAGE 15

# BAE SYSTEMS ACCOMPLISHMENT REPORT

I 

## SERVICE BULLETIN NUMBER 1 

## J_4_1-_5_2_-0_6_4

_ TITLE: DOORS -INTRODUCTION OF ULTRASONIC INSPECTION OFTHE UPPERAND

LOWER PASSENGER/CREW DOOR PINGUIDES TO: THE PUBLICATIONS CONTROL TEAM, AIRCRAFT MAINTENANCE & PUBLICATION SERVICES, BAE SYSTEMS, PRESTWICK INTERNATIONAL AIRPORT, AYRSHIRE, KA9 2RW, SCOTLAND. 

### Telephone: Fax: E-mail: (01292) 675207

(01292) 675704 

### RAPublications@baesystems.com PLEASE BEADVISED THAT THE ABOVE 

### SERVICE BULLETIN HAS BEEN EMBODIED ON AIRCRAFT CONSTRUCTORS NUMBER(S):

WE REQUESTTHE APPROPRIATE REVISIONSTOAPPLICABLE MANUALS.

NAME: . SIGNED: . COMPANY: . DATE: . . SERVICE BULLETIN COMMENTS/FEEDBACK Please report any non-technical comments orinaccuracies regarding thisservice bulletintothe above address.
BAE SYSTEMS (Operations) limited. Printed In the U.K.