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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-53A2835 Original Issue: October 28, 2010 ATA System: 5312 SUBJECT: FUSELAGE - Center Section: Station 520 To Station 2360 - Forward and Aft Lower Lobe Cargo Door Lower Sills - Latch Pin Inspection and Replacement Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.
9E991ECCN:
BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2010 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.
This document includes proprietary information owned by The Boeing Company and/or one or more third parties.
Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P.O. Box 3707, Seattle, Washington 98124.
Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, KC-10, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8A, Poseidon and the Boeing livery are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.
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4.0
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Table of Contents
Summary5
1. PLANNING INFORMATION9
A. Effectivity9
1. Airplanes9
2. Spares Affected ........................................ 2 0 B. Concurrent Requirements ...................................... 2 0 C. Reason ................................................ 2 0 D. Description .............................................. 2 1 E. Compliance .............................................. 2 1 F. Approval ............................................... 2 5 G. Manpower .............................................. 2 6 H. Weight and Balance Changes .................................... 2 8 I. Electrical Load Data ......................................... 2 8 J. References .............................................. 2 8
1. Existing Data .......................................... 2 8
2. Data supplied with this Service Bulletin ............................ 2 8
3. Installation Drawings Used in the Preparation of this Service Bulletin ............ 2 8 K. Publications Affected ........................................ 2 9 L. Interchangeability and Intermixability of Parts ........................... 2 9
2. MATERIAL INFORMATION ........................................ 3 1 A. Material - Price and Availability ................................... 3 1 B. Industry Support Information .................................... 3 1 C. Parts Necessary For Each Airplane ................................. 3 1
1. Kits/Parts ............................................ 3 1
2. Parts and Materials Supplied by the Operator ........................ 3 1
3. Parts Modified and Reidentified ................................ 3 2
4. Parts Removed and Not Replaced .............................. 3 2 D. Parts Necessary to Change Spares ................................. 3 2 E. Special Tooling - Price and Availability ............................... 3 2 F. Special Tooling Necessary to do this Service Bulletin ....................... 3 2
3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 3 A. GENERAL INFORMATION ..................................... 3 3 B. WORK INSTRUCTIONS ....................................... 3 4 FIGURE 1: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN INSPECTIONS . . 37 FIGURE 2: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN REPLACEMENT [Group 1-2, Configuration 1; Group 3] ................................. 4 0 FIGURE 3: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN REPLACEMENT [Group 1-2, Configuration 2] ...................................... 4 5 FIGURE 4: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN REPLACEMENT [Group 1, Configuration 3] ....................................... 5 0 FIGURE 5: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN REPLACEMENT [Group 1, Configuration 4] ....................................... 5 5 FIGURE 6: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN AND BEARING PLATE MODIFICATION OR REPLACEMENT [Group 1, Configuration 3] .............. 6 0 FIGURE 7: LOWER LOBE FORWARD AND AFT CARGO DOORS - LATCH PIN AND BEARING PLATE MODIFICATION OR REPLACEMENT [Group 1, Configuration 4] .............. 7 1
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Commercial Airplanes 747 Service Bulletin ALERT SummaryNumber: 747-53A2835Original Issue: October 28, 2010 ATA System: 5312 SUBJECT: FUSELAGE - Center Section: Station 520 To Station 2360 - Forward and Aft Lower Lobe Cargo Door Lower Sills - Latch Pin Inspection and Replacement
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
CONCURRENT REQUIREMENTS None.
BACKGROUND A latch pin, from the number 8 (most aft) latch position on aft lower lobe cargo door lower sill, has fractured in service. Investigation revealed the crack initiated by fatigue and propagated by a combination of fatigue and stress corrosion. If the latch pins on the forward and aft cargo door lower sill are not regularly inspected and broken latch pins are not replaced, the forward and/or aft cargo doors could open unexpectedly during service, causing rapid decompression and possible loss of the cargo door.
One operator has reported a fractured latch pin from the lower sill of the aft lower lobe cargo door. Part of the pin was found on the ground during an airplane walk around. The airplane had completed 75,495 flight hours and 9,393 flight cycles. A dye penetrant inspection of the remaining seven latch pins in the aft cargo door was done with no defects found. The number 8 latch pin was assumed to be original. The number 8 latch cam was a reworked/overhauled part. The latch pin fracture initiated on the pin internal diameter.
This service bulletin provides inspections for broken or cracked latch pins on the forward and aft lower lobe cargo door lower sills. Replacing broken or cracked latch pins will mitigate the possibility that a cargo door could open unexpectedly during service.
The inspections for broken or cracked latch pins provided by this service bulletin do not replace inspections for latch pin wear. OHM 52-34-11 and OHM 52-35-11 give wear limits for the latch pins.
Boeing Service Related Problem (SRP) 747-SRP-53-0351 is related to this service bulletin.
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Original Issue: October 28, 2010 747-53A2835 5 of 81
ACTION (PRR 85901-105RS) Group 1, Configuration 1-2; Group 2-3:
Open the lower lobe forward and aft cargo doors to get access to the latch pins on the lower sill. Do a general visual inspection for broken or missing latch pins and a detailed inspection of the latch pins for cracking. For each latch fitting location where a latch pin is broken, replace the latch pin and replace the latch pin(s) at the adjacent latch fitting location(s). For each latch pin where any crack is found, replace the latch pin. Put the airplane back to a serviceable condition. Repeat the inspections.
Group 1, Configuration 3-4:
Open the lower lobe forward and aft cargo doors to get access to the latch pins on the lower sill. Do a general visual inspection for broken or missing latch pins and a detailed inspection of the latch pins for cracking. Option 1: For each latch fitting location where a latch pin is broken, replace the latch pin and replace the latch pin(s) at the adjacent latch fitting location(s). For each latch pin where any crack is found, replace the latch pin. Option 2: Modify or replace the latch pins and modify the bearing plates at all latch fitting locations. Put the airplane back to a serviceable condition. Repeat the inspections.
EFFECTIVITY All 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR airplanes. Refer to Paragraph 1.A.1., Airplanes, for the list of affected airplanes.
COMPLIANCE Refer to Paragraph 1.E., Compliance.
The Federal Aviation Administration (FAA) will possibly release an Airworthiness Directive related to this service bulletin. The Airworthiness Directive will make the compliance tasks and times given in this service bulletin mandatory.
INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are not available for the configuration changes, inspection and/or repair procedures given in this service bulletin.
MANPOWER Refer to Paragraph 1.G., Manpower.
MATERIAL INFORMATION Operator Supplied Parts/Materials.
Refer to Paragraph 2.A., Material - Price and Availability
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DOORWAY LOWER SILL NOTE:
NUMBERS ADJACENT TO LATCH FITTINGS DENOTE LATCH FITTING LOCATIONS 6 2 LOCATIONS
SOME STRUCTURE
NOT SHOWN FOR CLARITY
INSPECT FOR BROKEN OR CRACKED LATCH PIN.
IF LATCH PIN IS CRACKED, REPLACE THE LATCH PIN.
IF LATCH PIN IS BROKEN OR
MISSING, REPLACE THE LATCH
PIN AND REPLACE THE LATCH
PIN(S) AT ADJACENT LATCH 16 LOCATIONS TOTAL TYPICAL FITTING LOCATION(S)
ODD NUMBERED LATCH FITTING LOCATION SHOWN,
EVEN NUMBERED LATCH FITTING LOCATION OPPOSITE B 1981402 Original Issue: October 28, 2010 747-53A2835 Copyright © Unpublished Work - See page 1 for details. BOEING PROPRIETARY - 7 of 81
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Commercial Airplanes 747 Service Bulletin ALERT Number: 747-53A2835 Original Issue: October 28, 2010 ATA System: 5312 SUBJECT: FUSELAGE - Center Section: Station 520 To Station 2360 - Forward and Aft Lower Lobe Cargo Door Lower Sills - Latch Pin Inspection and Replacement
THIS BULLETIN IS SENT TO THE OPERATORS OF RECORD OF THE AIRPLANES SHOWN IN PARAGRAPH
1.A., EFFECTIVITY. IF AN AIRPLANE HAS BEEN LEASED OR SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS SERVICE BULLETIN TO THE NEW OWNER.
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This service bulletin is for the airplanes shown below. An equivalent change is on subsequent production airplanes. Refer to PRR 85901-105RS for data about this change.
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DESCRIPTIONCONFIGURATIONGROUP 747 airplanes line numbers 1 through 263 and 265.-1 Airplanes that have modified or replaced latch pins and latch fitting bearing plates in accordance with Boeing Service Bulletin 747-52-2105 Original Issue, Revision 1 or Revision 2 on the lower lobe forward and aft cargo doors, or in accordance with Figure 6 or Figure 7 of this service bulletin, AND have done Boeing Service Bulletin 747-52-2260 Original Issue or Revision 1.
1 Airplanes that have modified or replaced latch pins and latch fitting bearing plates in accordance with Boeing Service Bulletin 747-52-2105 Original Issue, Revision 1 or Revision 2 on the lower lobe forward and aft cargo doors, or in accordance with Figure 6 or Figure 7 of this service bulletin, AND have not done Boeing Service Bulletin 747-52-2260 Original Issue or Revision 1.
2 Airplanes that have not modified or replaced latch pins and latch fitting bearing plates in accordance with Boeing Service Bulletin 747-52-2105 Original Issue, Revision 1 or Revision 2 on the lower lobe forward and aft cargo doors, or in accordance with Figure 6 or Figure 7 of this service bulletin, AND have done Boeing Service Bulletin 747-52-2260 Original Issue or Revision 1.
3 Airplanes that have not modified or replaced latch pins and latch fitting bearing plates in accordance with Boeing Service Bulletin 747-52-2105 Original Issue, Revision 1 or Revision 2 on the lower lobe forward and aft cargo doors, or in accordance with Figure 6 or Figure 7 of this service bulletin, AND have not done Boeing Service Bulletin 747-52-2260 Original Issue or Revision 1.
4 747 airplanes line numbers 264 and 266 through 1078.-2 Airplanes that have accomplished Boeing Service Bulletin 747-52-2260 Original Issue or Revision 1.
1 Airplanes that have not accomplished Boeing Service Bulletin 747-52-2260 Original Issue or Revision 1.
2 747 airplanes line numbers 1079 through 1419.-3 Airplane Models:
747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SP, 747SR GroupVariable Number 1RA001 - RA034
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GroupVariable Number 1RA101 - RA115 1RA161 - RA164 1RA201 - RA203 1RA216 - RA217 1RA245 - RA246 1RA251 - RA265 2RA266 1RA301 - RA317 2RA318 1RA351 - RA360 1RA369 - RA373 1RA401 - RA418 1RA501 - RA502 1RA521 - RA528 1RA532 - RA543 2RA544 - RA548 1RA551 - RA552 1RA559 - RA561 1RA581 - RA582 1RA585 1RA601 - RA602 1RA631 - RA635 1RA651 - RA652 1RA671 - RA677 1RA701 - RA702 1RA721 - RA724 2RA725 - RA731 1RA741 - RA745 1RA749 2RA750 1RA761 - RA762 1RA781 - RA783 2RA784
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GroupVariable Number 1RA901 - RA916 1RB001 - RB010 2RB011 - RB012 1RB013 - RB016 1RB041 - RB044 1RB071 - RB075 1RB101 - RB102 2RB411 - RB413 2RB421 1RB601 - RB607 2RB681 - RB697 2RB711 2RB721 - RB723 2RB741 - RB748 1RD001 - RD004 1RD021 - RD022 1RD041 - RD044 2RD045 - RD059 1RD071 - RD072 2RD081 - RD083 2RD091 - RD092 1RD101 - RD104 2RD121 - RD127 2RD131 - RD144 2RD166 - RD167 2RD171 - RD172 2RD181 - RD183 2RD201 - RD204 2RD221 - RD227 2RD231 - RD235 2RD241 - RD243 2RD251 - RD262 2RD271 - RD272
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