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BEHINO Commercial 707/720 Airplane Group Service Bulletin Number: 3477 Revision Transmittal Sheet Date: July 26, 1990 Revision 2: April 15, 1993 ATA System: 5211 SUBJECT: DOORS - MAIN CARGO DOOR - LATCH CAM REPLACEMENT AND PRESSURE RELIEF
DOOR HINGE FITTING REPLACEMENT This revision includes all pages of the service bulletin.
COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Airworthiness Directive 91-22-04, Amendment 39-8064, is related to this service bulletin.
No more work is necessary on airplanes changed by the initial release or Revision 1 of this service bulletin.
SUMMARY This revision adds instructions to trim the hinge fitting if there is interference between the cam and the hinge fitting when the door is in the closed position. Optional fasteners are added for the installation of the hinge fitting. This revision also defines the maximum allowable wear limits for the latch cams.
Paragraph I.A., Effectivity, shows changes of airplane operators. Each operator should examine the Effectivity paragraph for changes.
Vertical lines are put on the left edge of each page, except in Paragraph I.A., Effectivity, to show the location of important changes.
Pages with a revision number and date, but no vertical lines have no important changes.
REVISION HISTORY Initial Release: July 26, 1990/ Revision 1: June 4, 1992 Revision 2: April 15, 1993 BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE. WASHINGTON 98124-2207
BOEINO Commercial 707/720 Airplane Group Service Bulletin Number: Date: 3477 July 26, 1990 Summary Revision 2: April 15, 1993 ATA System: 5211 SUBJECT: DOORS - MAIN CARGO DOOR - LATCH CAM REPLACEMENT AND PRESSURE RELIEF
DOOR HINGE FITTING REPLACEMENT
BACKGROUND The main cargo doors on 707 airplanes with main cargo doors are almost the same as those on the 757 Package Freighter airplane. When the 757 Package Freighter was designed, better latch cams, and better hinge fittings for the pressure relief doors were designed for the main cargo door.
Boeing has received several reports of wear of the lock stop part of hinge fittings on the pressure relief doors on 707 and 727 Cargo and Freighter Boeing has also received reports of wear of the latch cams on the main cargo doors on 707 and 727 Cargo and Freighter airplanes. Wear of the lock stop part of the hinge fittings and of the latch cams is thought to be caused by incorrect operation sequence of the hydraulic system of the main cargo door.
This service bulletin shows how to install the better latch cams and hinge fittings on main cargo doors.
Installation of the better parts will extend the service life of the door latch system.
Continued operation with installed latch cams and hinge fittings that are worn beyond the limits given in this service bulletin is not satisfactory. Persons cannot make sure that the main cargo door is correctly latched and locked under all possible operational conditions if the hinge fittings or the latch cams are worn beyond the limits given in this service bulletin.
ACTION At the next "C" check after receipt of this service bulletin, or 3000 flight-cycles, whichever occurs sooner, do a visual inspection of the mating surfaces on the hinge fittings and the latch cams.
If the hinge fittings are not worn, or are worn within the limits given in this service bulletin, either install new hinge fittings and latch cams, or do the visual inspection again at each "5C" check, or 8000 flight-hours, whichever occurs sooner. If the hinge fittings are worn beyond the limits given in this service bulletin, install new hinge fittings and latch If the latch cams are worn or damaged, install new hinge fittings and latch cams. After the new hinge fittings and latch cams are installed as shown in this service bulletin, return to the normal inspection interval.
Federal Aviation Administration (FAA) Airworthiness Directive 91-22-04, Amendment 39-8064 is related to this service bulletin
EFFECTIVITY All 707 airplanes with main cargo doors
MANPOWER Total Man hours - 34 for each airplane Elapsed Time - 17 Hours
MATERIAL INFORMATION Boeing Supplied Kit See Paragraph IF for applicable terms and conditions.
BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE. WASHINGTON 98124-2207 Summary Page 1 of 2
BOEING SERVICE BULLETIN 3477 INBD
PRESSURE RELIEF DOOR LATCH CAM- LATCH CAM
BELLCRANK
REPLACE THE HINGE FITTINGS REPLACE THE LATCH
ON EACH PRESSURE RELIEF DOOR CAMS AND THE BELLCRANK 764748 (2 PLACES) INBD (4 PLACES) Jul 26/90 REV. 2: Apr 15/93 Summary Page 2 of 2
BOEINO Airplane Commercial 707/720 Group Service Bulletin Number: 3477 Date: July 26, 1990 Revision 2: April 15, 1993 ATA System: 5211 SUBJECT: DOORS - MAIN CARGO DOOR - LATCH CAM REPLACEMENT AND PRESSURE RELIEF
DOOR HINGE FITTING REPLACEMENT
1. PLANNING INFORMATION A. Effectivity
1. Airplanes Affected Refer to the Service Bulletin Index Document D6-1647, Part 3 for Airplane Variable Number, Line Number, and Serial Number data.
This change is applicable only to airplanes given below.
IDENTIFICATION BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER
AERO URUGUAY (AUG) 07454
AERONAVES DEL PERU (REC) 07606 07618
AFRICAN AIRLINES (AFX) 07049 AHK AIR HONG KONG LTD. (AHK) 07008 08077
AIR CHINA (BEJ) 09003-09004 09006
AIR RWANDA (RWD) 08002
AIR TCHAD AIRLINES (TCH) 08402
ALENIA (AET) 08329-08330 ALYEMDA DEM. YEMEN AIRLINES (ALY) 08075 08475
ANGOLA AIRLINES (ANG) 07079 07081 20120 07608 07684 08401 Jul 26/90 3477 REV. 2: Apr 15/93 Page 1 of 37
BOEING SERVICE BULLETIN 3477
AVIATION CONSULTANTS (ACT) 07603 08073
AVIATION RESEARCH CENTRE (AVR) 07701-07702 AVISTAR CYPRUS LTD. (APU) 08003 BMAC E-3A FLT. CREW TRAINING (B02) 07403 07455 BUFFALO AIRWAYS, INC. (BUF) 07010 07042 07054 07207 07259-07260 07620 07807 07816 08152 08191
CANADIAN DEPT OF DEFENSE (DND) 08406-08410
CHALLENGE AIR CARGO (CHA) 08055
CHILIAN AIR FORCE (CHF) 07619
CHINA SOUTHWEST AIRLINES (XIN) 09001-09002 09005
COLOMBIAN AIRFORCE (CLB) 07109 COMTRAN INTERNATIONAL INC. (CII) 07078
CORDOBA AIR CARGO (CAG) 07625
CORSAIR (CRA) 07614
DIARO AIR SERVICES (DAR) 07052 07607 07802/ 08309 08474
DOMINICANA AIRLINES (DOM) 08192
DUBAI AIR WING (DAW) 09251
E-SYSTEMS (ESM) 08172
ECUATORIANA AIRLINES (ECU) 07045 REV. 2: Apr 15/93 Jul 26/90 347]
BOEING SERVICE BULLETIN 3477
EGYPTAIR (EGP) 08201 08203 08205-08207 08210 EL AL ISRAEL AIRLINES, LTD. (ELA) 08581-08582 ETHIOPIAN AIRLINES, CORP. (ETH) 08129
EXECUTIVE AVIATION SERVICES (EXS) 07611 F.F.T. FRESH FOOD TRADING (FFT) 07262
FASTAIR CARRIER (FAC) 07458
FLORIDA WEST AIRLINES (PAI) 07615-07616
FUERZA AEREA ARGENTINA (AGF) 06461 08310 08312 08452 GENERAL ELECTRIC CORP. (GEC) 02017
GERMAN REPUBLIC (GRF) 08221-08224
GLOBAL AIR (GLH) 08051
GOVERNMENT OF BRAZIL (BRZ) 07080 08304 08308 08314
GOVERNMENT OF EGYPT (EGG) 08209
GRUMMAN MELBOURNE SYSTEM (GMS) 07057 07107 07265 07808-07809 07812-07813 07817 08102 08327
HEAVYLIFT AIRCRAFT ENGINEERING (HVL) 07075
INDONESIAN AIR FORCE (IDO) 09227
INTERNATIONAL AIR LEASES (IAL) 07043
IRAN AIR (IRN) 07016 08551-08553 09438 Jul 26/90 REV. 2: Apr 15/93 347]
BOEING SERVICE BULLETIN 3477
IRAN ISLAMIC AIR FORCE (IAF) 09101-09107 09161-09167
IRAQI AIRWAYS (IRQ) 09221-09223
ISRAELI AIR FORCE (ISR) 07406-07407 08021 08243 08251
JAMAHIRIYA AIR TRANSPORT (UAA) 07502-07503 07605 JET CARGO LIBERIA LTD. (JTC) 08501 JET LEASE, INC. (JLI) 07058 07401 07451
JUGOSLOVENSKI AEROTRANSPORT (JAT) 07073
LADECO (LDE) 08128 LAN-CHILE S.A. (LAN) 07253 07602 07661
LIBYAN ARAB (LAA) 07819 09411
LLOYD AERO BOLIVIANO (LAB) 07261 MIDDLE EAST AIRLINES S.A. (MEA) 07251-07252 07264 08317-08318 08404-08405 MILLON AIR, INC. (MLA) 07257
NAGANAGANI (NNG) 08072 NIGERIA AIRWAYS, LTD. (NIA) 08319 08333 NMB SINGAPORE LTD. (NMB) 08313
NORTH ATLANTIC TREATY ORGANIZATION(NATO) (NAT) 07904-07906
OKADA AIR (OKD) 08301
OMEGA AIR (OMG) 07255 07810 08173 Jul 26/90 REV. 2: Apr 15/93 3477
BOEING SERVICE BULLETIN 3477 PAKISTAN INTERNATIONAL AIRLINES CORP. (PIA) 07104 07267 08143-08144 08325
PAN AVIATION (PAV) 07053
PERUVIAN AIR FORCE (PRF) 07266
QATAR (QAT) 08076 09421
RACE AVIATION CORPORATION (RAC) 07006
REPUBLIC OF LIBERIA (LBG) 05603
ROYAL AIR MAROC (RAM) 07622-07623
ROYAL AUSTRALIAN AIR FORCE (RAA) 07814-07815 07818 07820 09288
ROYAL JORDANIAN AIRLINE (RJA) 08101
ROYAL MOROCCAN AIR FORCE (MRC) 09441 S. R. ACQUISITION CORP. (SRC) 08127 SAETA S.A. (SAE) 07191 SAFAIR FREIGHTERS (PTY) LTD. (SFA) 07268 08242 08244
SAUDI ROYAL FLEET (SRF) 09281 09290
SCIBE-AIRLIFT KINSHASA (SAK) 07907
SICOTRA AVIATION (SAZ) 07105
SKY AIR CARGO (SAC) 07201
SKYWAYS INTERNATIONAL, INC (SKL) 07617 07621 SOUTHERN AIR TRANSPORT, INC. (STT) 08306 08471-08472 Jul 26/90 REV. 2: Apr 15/93 3477
BOEING SERVICE BULLETIN 3477
SPANISH AIR FORCE DATA SUPPORT (SAF) 07405 09289
SUDAN (SUD) 08473 09231-09232 09287
TAMPA AIRLINES/COLOMBIA (TMP) 07004 07007 07071 07077 07801
TAROM ROMANIA (TRM) 07044 07056 09201-09203
TRANS ARABIAN AIR TRANSPORT (TRB) 07047 08054
TRANS MEDITERRANEAN AIRWAYS (TMA) 07041 07046 07206 07453 08121-08122 08125 TRANSBRASIL AIRLINES INC. (TBL) 07270 08053 08171
TRATCO LEASING (TRT) 08004-08005 08008 USAF - 707 C-137 PROGRAM (U02) 08271 USAF - 707 C-18A PROGRAM (U03) 07211-07213 07215 USAF - 707 EC-18B PROGRAM (U04) 07254 07256 07258
VENEZUELAN AIR FORCE (VEN) 08103-08104
ZAS AIRLINES (ZAA) 08007 08074
IDENTIFICATION BY VARIABLE NUMBER 02017 05603 06461 07001-07017 07041-07059 07071-07081 07101-07109 07181 07191 07201-07215 07251-07271 07401-07407 07451-07458 07501-07504 07601-07626 07661-07662 07681-07684 07701-07702 07801-07821 07901-07907 08001-08008 08021 08051-08056 08071-08077 08101-08104 08121-08129 08141-08144 08151-08153 08171-08173 08191-08192 08201-08210 08221-08224 08241-08244 08251 08261 08271 08301-08320 08324-08330 08333 08401-08410 08451-08452 08471-08475 08501-08502 08551-08553 08581-08582 09001-09006 09101-09107 09161-09167 09201-09204 09221-09223 09227 09231-09232 09251 09271 09281 09286-09290 09411 09421 09438 09441 Jul 26/90 3477 REV. 2: Apr 15/93
BOEING SERVICE BULLETIN 3477
2. Spares Exy pants are ourd, ster lo ferg apns D, Efed in Parts Accoun abiy, ing Pa resonendab use f Jul 26/90 REV. 2: Apr 15/93 3477
BOEING SERVICE BULLETIN 3477 B. Reason The main cargo doors on the 707 airplanes that have main cargo doors are almost the same as those on the 757 Package Freighter airplane. When the 757 Package Freighter was designed, better latch cams, and better hinge fittings for the pressure relief doors were designed for the main cargo door. The new latch cams and hinge fittings for the 757 Package Freighter were designed to provide better resistance to wear.
This service bulletin shows how to install the better latch cams and hinge fittings on the main cargo doors on 707 airplanes that have a main cargo door. Installation of the better parts on the main cargo doors will extend the service life of the door latch system.
Boeing has received several reports of wear of the lock stop part of hinge fittings on the pressure relief doors on 707 and 727 Cargo and Freighter airplanes. Boeing has also received reports of wear of the latch cams on the main cargo doors on 707 and 727 Cargo and Freighter airplanes. Wear of the lock stop part of the hinge fittings and of the latch cams is thought to be caused by incorrect operation sequence of the hydraulic system of the main cargo door. Incorrect operation sequence of the hydraulic system of the main cargo door can occur in service due to wear of components of the door's hydraulic system, or due to a hydraulic system that is not adjusted correctly.
Continued operation with installed latch cams and hinge fittings that are worn beyond the limits given in this service bulletin is not satisfactory. Persons cannot make sure that the main cargo door is correctly locked and latched under all possible operational conditions if the hinge fittings or the latch cams are worn beyond the limits given in this service bulletin.
Revision 2 adds instructions to trim the hinge fitting if there is interference between the cam and the hinge fitting when the door is in the closed position. Optional fasteners are added for the installation of the hinge fitting. This revision also defines the maximum allowable wear limits for the latch cams.
Jul 26/90 3477 REV. 2: Apr 15/93 8
BOEING SERVICE BULLETIN 3477 C. Description At the next "C" check after receipt of this service bulletin, or 3000 flight-cycles, whichever occurs sooner, do a visual inspection of the mating surfaces of the hinge fittings (on the pressure relief doors) and the latch cams. If the hinge fittings are not worn, or are worn within the limits given in this service bulletin, either install the new hinge fittings and latch cams as shown in this service bulletin, or do the visual inspection again at each "5C" check, or 8000 flight-hours, whichever occurs sooner, until the hinge fittings and latch cams are replaced as shown in this service bulletin. If the hinge fittings are worn beyond the limits given in this service bulletin, install the new hinge fittings and latch cams as shown in this service bulletin. If the latch cams are worn or damaged, install the new hinge fittings and latch cams as shown in this service bulletin. After the new hinge fittings and latch cams are installed, return to the If it is necessary to install the new hinge fittings and latch cams, remove the lining and the insulation from the lower part of the main cargo door. Remove and discard the four pairs of latch cams along with their matched bellcranks. Install new latch cams and their matched bellcranks on the main cargo door, along with new closed-and-latched indicators. Remove the hinge fittings from the pressure relief doors on the main cargo door and install new hinge fittings on the pressure relief doors. Do a test of the main cargo door to make sure that the door operates, latches, and locks correctly. Do a test of the control system for the door to make sure it operates correctly. Do a test of the door warning system for the main cargo door to make sure it operates correctly. Install the lining and the insulation on the inside of the cargo door and Federal Aviation Administration (FAA) Airworthiness Directive 91-22-04, Amendment 39-8064 is related to this service bulletin.
NOTES:
1. If the main cargo door was deactivated as shown in Service Bulletin 3311 "Main Cargo Door Deactivation/Reactivation System Installation", and no attempt has been made to open the cargo door after it was deactivated, then the inspection shown in this service bulletin can be ignored.
2. If the main cargo door was deactivated as shown in Service Bulletin 3311 "Main Cargo Door Deactivation/Reactivation System Installation" then the changes shown in this service bulletin
3. Time will be saved if the changes shown in this service bulletin are done at the same time as the changes shown in Service Bulletin 3387 "Main Cargo Door Cam Support Fitting Inspection and Replacement®.
D. Approval This service bulletin was examined by the Federal Aviation Administration (FAA). The changes shown in this service bulletin agree with the applicable Federal Aviation Regulations (FAR's) and are FAA approved.
The FAA has examined the inspection and replacement procedures specified in Revision 2 to Service Bulletin 3477, "DOORS - MAIN CARGO DOOR - LATCH CAM REPLACEMENT AND PRESSURE RELIEF DOOR HINGE FITTING REPLACEMENT". The FAA has approved the inspection and replacement procedures in Revision 2 of Service Bulletin 3477 as an alternative to those specified in Airworthiness Directive (AD) 91-22-04, Amendment 39-8064.
Jul 26/90 3477 REV. 2: Apr 15/93 9