SUBJECT: FUSELAGE - MAIN WHEEL WELL PRESSURE FLOOR INSPECTION, MODIFICATION

AND REPAIR

NOTE: This revision includes all pages of the service bulletin.

SUMMARY

This revision is sent to provide information about a new top kit and new supplemental kits. The

inspection area is expanded to examine the beads at Body Station 950. Also an inspection threshold and a repeat inspection interval are added for all areas not repaired or preventively modified as described in Part III of the Accomplishment Instructions. The intent of

727-53-0149NSC1 and 727-53-0149NSC2 are also added.

Airplane Effectivity shows changes of airplane operators.

No more work is necessary on airplanes changed by Revision 3 of this service bulletin.

More work is necessary on airplanes changed by the original issue, Revision 1 or Revision 2 of this

service bulletin. The work necessary is to add the additional doublers at right and left buttock line

50 to the side of the body, between body station 920 and 950.

Vertical lines on the left edge of each page show the location of data changes. If no vertical lines

are shown on a page, no important changes were made on that page.

REVISION HISTORY

Original Issue: May 4, 1979

Revision 1: September 19, 1980

Revision 2: March 20, 1981

Revision 3: November 2, 1989

Revision 4: June 27, 1991
ATA System:

Number:

Date:

Revision 4:

5314 Summary 727-53-0149

May 4, 1979

June 27,1991

SUBJECT: FUSELAGE - MAIN WHEEL WELL PRESSURE FLOOR INSPECTION, MODIFICATION

AND REPAIR

BACKGROUND

Based on a structural review of the 727 airplane,

incorporation of the modification per this service

bulletin is recommended on aging airplanes.

Eight operators have reported 34 cracks on 20

airplanes, each along the ends of the pressure

floor reinforcing beads at Stations 930 and 940.

The cracks ranged from 0.38 to 15.25 inches in

length. Propagation of undetected cracks could

result in cabin pressurization difficulties.

Since Revision 3 of this service bulletin, similar

cracks have been reported at Body Station 950.

The airplanes had accumulated between 24,000

and 42,200 flight cycles and 24,000 and 49,500

flight hours.

Although there have been no reports of cracking

at Stations 880 and 890, the possibility exists

that cracks may develop at these stations also.

This service bulletin is the subject of FAA

Airworthiness Directive 90-17-06 Amendment

39-6691 which supersedes existing Federal

Aviation Administration (FAA) Airworthiness

Directive 88-26-02, Amendment 39-6089.

ACTION (PRR 24311 )

As recommended by the 727 Aging Fleet

Structures Working Group, accomplish modification per the Accomplishment

Instructions at or before the accumulation of

60,000 flight cycles.

When the airplane has 20,000 flight cycles, or

within the next 2500 cycles, whichever is later,

inspect the ends of the pressure floor beads

adjacent to Stations 880, 890, 930, 940 and

950. If the previous inspection is High Frequance Eddy Current, examine at 5000 flight

cycle intervals. If the previous inspection is

visual or dye penetrant, examine at 4000 flight

cycle intervals. Repeat inspection until

preventive modification or permanent repair is

accomplished. Cracks in specified areas may be

repaired with doublers. An interim repair may be

accomplished providing a permanent repair is

made within 600 flights thereafter.

Airplanes previously modified per the original

release, or Revision 1 or 2 of this bulletin, or

Group 2 airplanes require repeat inspection for

cracks in the pressure floor web at BS 930, 940

and 950 between Buttock Lines 50 and 63 until

additional doublers are installed per this

Revision 4.

Airplanes previously repaired using

fasteners require replacing fasteners

accumulating 10,000 flight cycles.

blind

upon

EFFECTIVITY

All 727 airplanes

Group 1 - Line Position 1-1432

Group 2 - Line Position 1433-1832

MANPOWER

Total Manhours - 274 per airplane

Elapsed Time - 42 Hours

MATERIAL INFORMATION

Kit

69-70864-3

69-70864-4

69-70864-5

* See Paragraph I.

applicable to

information

Price*

$3282.00

$5565.00 $ 3624.00

F. for terms and conditions

price and delivery

BOEING COMMERCIAL AIRPLANE GROUP P.O. BOX 3707 SEATTLE, WASHINGTON 98124-2207 Summary Page 1 of 2
May 4/79

Rev. 4: Jun 27/91 Summary Page 2 of 

2
ATA System:

Number:

Date:

Revision 4:

5314

727-53-0149

May 4, 1979

June 27,1991

SUBJECT: FUSELAGE - MAIN WHEEL WELL PRESSURE FLOOR INSPECTION, MODIFICATION

AND REPAIR

I. PLANNING INFORMATION

A. Effectivity

1. Airplanes

Refer to Service Bulletin Index Document D6-9825, Part 3 for Airplane Variable Number, Line

Number, and Serial Number data.

An equivalent change was incorporated in production in accordance with PRR 24311 on

applicable airplanes other than those listed below.

LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER

CUSTOMER

GROUP VARIABLE NUMBER

A. L. I. (IBA)

1 E3026

ACES (ACE)

1 E0130

E3116

E3148

AERO CHASQUI (CHQ)

1 E3501 E3653

AERO PERU (PER)

1 E3503 E3621

E3651

E5278

AEROEJECUTIVO (AEJ)

1 E0101 E0404

AEROLINEAS ARGENTINAS (ARG)

1 QD601-QD602

2 QD450 QD603-QD607

AERONICA (ANC)

1 E0133

AIR ALGERIE (ALG)

1 QA574-QA576 QB451-QB453

2 QB454-QB458

AIR CANADA (ACN)

1 QD205 QD209-QD210

2 QD215-QD223 QD225 QD231-QD239

May 4/79

Rev. 4: Jun 27/91

727-53-0149

Page 1 of 53
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

AVIANCA (AVI)

1 E3036 E3064

E3402 E3406

QD553-QD554

2 QD581-QD583 QD991-QD992

AVIATION CONSULTANTS (ACT)

1 E3076

AVIATION SALES CO., INC. (ASC)

1 QA038 QA908

E3068-E3069

E5451

E3141-E3143

E5453

E3204

QA572

E3221-E3224

QB031-QB033

QA918

AVIOGENEX AIR TRANSPORT (AVG)

1 QD006 QD191-QD192

2 QD518

BAHRAIN, GOVT OF (BHR)

2 QD451

BELGIAN AIR FORCE (BLG)

1 E5351-E5352

BRADLEY AIR SERVICES (BRS)

1 E3065 E5112

BRANIFF AIRLINES (BNF)

1 QA002 QA359

BRITHEN LTD. (BTN)

1 E0211

BURLINGTON NORTHERN (BNR)

1 E3509

CARNIVAL AIR (CVL)

1 E3030 QA636

CHINESE AIR FORCE (CAF)

1 E3506 E3512

E5141 E5481-E5483

QA641

E5409 E5435

CITICORP INDUSTRIAL CREDIT (CIC)

1 QD206

CLAY LACY AVIATION, INC. (CYA)

1 E3077

CONNIE KALITTA FLYING SERVICES (CKF)

1 E0304 E5050

CONTINENTAL AIRLINES, INC. (CAL)

1 E0038-E0042 E0202 E0205

E3247 E3253 E5201

QA301-QA304 QA306 QA308-QA314

QD501-QD509

2 QA345-QA349 QB901-QB904 QD510

E3001

E5455

QA325-QA344

E3241 E3245

QA019-QA021 QA059-QA072

QA870-QA893 QA896

QD512-QD517

May 4/79

Rev. 4: Jun 27/91

727-53-0149

2
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

AIR COLUMBUS (COB)

1 QL001-QL002

AIR FRANCE (AFA)

1 QA351-QA352 QA551 QA554

2 QD761-QD769 QD781-QD782

AIR JAMAICA (JAM)

1 QD281-QD284

AIR PANAMA INTERNATIONAL (PAN)

1 E3115

AIR TRANSAT (AIJ)

1 QD206-QD207 QD212

AIRCRAFT SUPPORT GROUP (ASG)

1 E3202

AIRLINE CREDIT CONSULTANTS (ACJ)

1 E0340 E3070 E3076

QA561-QA562 QA565-QA570

ALASKA AIRLINES (ASA)

1 E3401 E3521

QD902 QD904-QD905

2 QB619 QB622

QD909 QD952-QD954

E5058

QD931-QD932

QB624-QB628

E5142

QD951

QD555

QA378

QD558

QA894-QA895

QD791

ALLRED INTERNATIONAL, INC. (RED)

1 E0206

AMERICAN AIRLINES, INC. (AAL)

1 E0301-E0303 E0305-E0309

E0336-E0339 E0345

QA101-QA178 QA854

2 QA179-QA199 QB801-QB810

E0311-E0326

E0348-E0349

QA856-QA869

E0328-E0330

E3075

E0332 E0334

E3519-E3520 QA014

AMERICAN TRANS AIR (AAT)

1 E3029 E3032-E3033 E3286-E3289

AMERIJET INTERNATIONAL, INC. (AMJ)

1 E0104 E3028 E3073-E3074 E3145

E5403

AMWAY PRODUCTS (AMA)

1 E3681

ANSETT AIRLINES OF AUSTRALIA (ANS)

1 E0119 QD034

2 QD040 QD043-QD046

ARIANA AFGAN AIRLINES CO., LTD (AFG)

1 E5410 E5424

May 4/79

Rev. 4: Jun 27/91

E3341 E5161

727-53-0149

3
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

AUSTRALIAN AIRLINES LIMITED (AUS)

1 QD001-QD004 QD007-QD008

2 QD009-QD012

AVENSA (AVN)

1 E0034-E0036 E3072 E3244

QA036 QA039 QA041-Q

AVIANCA (AVI)

1 E3036 E3064 E3069

E3204 E3221-E3224 E3402

QA572 QB031-QB033 QD553-Q

2 QD581-QD583 QD991-QD992

AVIATION SALES CO., INC. (ASC)

1 QA038 QA908 QA918

AVIOGENEX AIR TRANSPORT (AVG)

1 QD006 QD191-QD192

2 QD518

BAHRAIN, GOVT OF (BHR)

2 QD451

BELGIAN AIR FORCE (BLG)

1 E5351-E5352

BRADLEY AIR SERVICES (BRS)

1 E3065 E5112 E5141

BRANIFF AIRLINES (BNF)

1 QA002 QA359

BRITHEN LTD. (BTN)

1 E0211

BURLINGTON NORTHERN (BNR)

1 E3509

CARNIVAL AIR (CVL)

1 E3030 QA636 QA641

CHINESE AIR FORCE (CAF)

1 E3506 E3512 E5409

CITICORP INDUSTRIAL CREDIT (CIC)

1 QD211

CLAY LACY AVIATION, INC. (CYA)

1 E3077

CONNIE KALITTA FLYING SERVICES (CKF)

1 E0304 E5050

E3246

A043 QA853

D554

E3141-E3143

E3406

E5481-E5483

E5435

May 4/79

Rev. 4: Jun 27/91

727-53-0149

4

E3248

QD121

E3146

E5451

E3511

E3149

E5453
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

CONTINENTAL AIRLINES, INC. (CAL)

1 E0038-E0042 E0202 E0205

E3247 E3253 E5201

QA301-QA304 QA306 QA308-QA314

QD501-QD509

2 QA345-QA349 QB901-QB904 QD510

CORSAIR (CRA)

1 E3002

E3001

E5455

QA325-QA344

E3241 E3245

QA019-QA021 QA059-QA072

QA870-QA893 QA896

QD512-QD517

E3011-E3012

CRUZEIRO DO SUL (CRU)

1 E3071 E3345

DALLAH AVCO (AVO)

1 E3038

DAN AIR (DAN)

1 QB035 QB114

QL031-QL032

DAVIS OIL CO. (DOC)

1 E3206

E3781-E3783

QD033 QD123

DELTA AIR LINES, INC. (DAL)

1 QA073-QA079 QA081-QA092 QA096-QA099 QA907

QA929-QA933 QB501-QB552

2 QA939-QA946 QA949 QB553-QB558 QB560-QB575

DHL CORPORATION/WORLDWIDE COURIER EXP. (DHL)

1 E0030 E0124 E3622 E5046-E5047

E5382 E5402 QA552-QA553 QA555-QA556

DIRECTORATE OF POLICE AVIATION (OMAN) (OMA)

1 E0210

DOMINICANA AIRLINES (DOM)

1 E3755 E5404

QD903 QL004-QL005

QA909-QA917 QA919-QA926

E5273-E5274 E5281

QA563-QA564

QD351

DONREY, INC. (DON)

1 E3014

DONVAN ENTERPRISES, INC. (DNV)

1 E0351

E-SYSTEMS (ESM)

2 QD908

EASTERN AIR LINES, INC. (EAL)

1 QA601-QA605 QA607-QA620 QA622

QA642-QA653

2 QA659-QA671 QA673-QA684 QA686-QA688

ECHO BAY MINES (EKO)

1 E5418

May 4/79

Rev. 4: Jun 27/91

QA624 QA628 QA630-QA634

727-53-0149

5
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

EMERY WORLDWIDE (EAF)

1 E5003 E5005

EMIRATES AIRLINES (EAD)

2 QB065 QD452

E5007-E5011

QD972

ETHIOPIAN AIRLINES, CORP. (ETH)

2 QD661-QD663 QD971

EUROPE AERO SERVICE (EUR)

1 QA573 QA855

EUROPEAN AIR TRANSPORT (EPT)

1 E3701-E3703

EVERGREEN INTERNATIONAL AIRLINES (EVR)

1 E3101 E3151-E3152 E3275-E3276

E5277

E3652 E5104-E5105

E5426

F.A.M.C.O. (AVIATION) (FAM)

1 E5353

FAHAD AL-TAMEEMI (TMI)

1 E3410

FAUCETT (COMPANIA DE AVIATION S.A. (FCT)

1 QA901 QA904

FEDERAL AVIATION ADMINISTRATION (FAA)

I E0201 E5241

FEDERAL EXPRESS (FED)

1 E0023-E0028

E0310

E3254-E3274

E5056-E5057

E5226-E5240

QA897-QA899

2 QB610-QB617

E0120

E0331

E3277-E3283

E5059-E5063

E5242

QB601 -QB609

QD039

E0122-E0123

E0333

E3290

E5067

E5408

QD035-QD038

QD041-QD042

E0125-E0129

E0335

E3577

E5101-E5102

E5420

QD201-QD204

QD224

E0131-E0132

E0341-E0344

E5048-E5049

E5163-E5164

E5454

QD208

QD226-QD230

E0134-E0138

E0346-E0347

E5052-E5054

E5221-E5224

QA093-QA095

QD213-QD214

QL501-QL515

FORBES, INC. (FRB)

1 E3655

FREEPORT-MCMORAN (FMR)

1 E3346

FUNAIR (FUN)

1 E3419

GEORGETOWN AIRCRAFT SERVICES (GEO)

1 E0216

GLENHOLME ENTERPRISES INC. (GLE)

1 E3144

GOVERNMENT OF MEXICO (MXG)

1 E3037

May 4/79

Rev. 4: Jun 27/91

727-53-0149

6

E5413 E5415

E5108
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

GOVERNMENT OF SENEGAL (SEN)

1 QD402

GOVT. OF BURKINA FASO (HTV)

1 E3176

GUESS?, INC. (GES)

1 E3420

HAPAG LLOYD (HAP)

1 E3114 E3452

HCL AVIATION, INC. (HCL)

1 E3242

2 QA658

IBERIA (LINEAS AEREAS DE ESPANA S.A.) (IBE)

1 QB121-QB145 QB147-QB149 QB151-QB153

2 QB155-QB158

IMPERIAL PALACE AIR LTD. (IPA)

1 E0213

INTERNATIONAL AIR LEASES (IAL)

1 E3068 QA004 QA902 Q

IRAN ISLAMIC REPUBLIC AIRLINE (IRN)

1 E0204 E3118 E3472-E3473 Q

IRAQI AIRWAYS (IRQ)

1 QD421-QD423

2 QD424-QD426

ISTANBUL AIRLINES (IST)

1 QA557-QA558

ITAPEMIRIM TRANSPORTES AEREOS S.A. (ITP)

1 E3344

JET AVIATION (JTA)

1 E3407

JET EAST, INC. (JTE)

1 E0418 E0420-E0422 E3117 E3

E3350 QD032

JUGOSLOVENSKI AEROTRANSPORT (JAT)

1 QD142-QD145

2 QD146-QD149

KABO AIR LIMITED (KAB)

1 E0103 E0107

KALAIR USA CORPORATION (KLA)

1 E3604

KELOWNA FLIGHTCRAFT AIR CHARTER LTD. (KEL)

1 E5001 E5428

A905-QA906

D101-QD105

3201 E3205

May 4/79

Rev. 4: Jun 27/91

E3347-E3348

727-53-0149

7
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

KEY AIRLINES (KEY)

1 E0029 E0033 E3027 E3243 E3250-E3252 E3571

QA559-QA560

KOREAN AIR LINES, INC. (KAL)

1 QA015 QA022 QA024-QA025 QA033-QA035 QA037 QA040

QA044-QA046

KUWAIT AIRWAYS CORPORATION (KUW)

2 QD801-QD804

LACSA (LAC)

1 E3654 QD031

2 QD701-QD702 QD907

LADECO (LDE)

1 E0032 E3103 E3517 E3573

LIBYAN ARAB (LAA)

1 QA316-QA324 QB651

LILTIJARA CO., LTD. (LIL)

2 QD973

LINA CONGO (LNA)

2 QD446

LLOYD AERO BOLIVIANO (LAB)

1 E3102 E3522 E5421 QD161-QD163

LUFTHANSA GERMAN AIRLINES (DLH)

1 QB105-QB106 QB108-QB109 QB16 QB305 QB307-QB308 QB310-QB315

2 QB316

MCNALL AVIATION (MCN)

1 E3035

MEXICAN AIR FORCE (MXA)

1 E3171-E3172 E3175

MEXICANA (CMA)

1 QA654-QA656 QB034 QB036-QB045 QD085-QD088 QD444

2 QA657 QB046-QB049 QB051-QB058 QB060-QB064 QD556-QD557 QD571-QD572

MEZEL AIR LTD. (MEZ)

1 QD906

MGM GRAND AIR (MGM)

1 E3504-E3505 E3510

MIAMI AIR INTERNATIONAL INC. (MIB)

2 QA672

MME AVIATION (CAYMAN ISLANDS) LTD. (MME)

1 E0209

MRH AVIATION LTD. (BLA)

1 E3005

May 4/79

Rev. 4: Jun 27/91

727-53-0149

8
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

NIGERIA, GOV OF (NGA)

2 QL081

NOBLE AIR (NOB)

1 QB351-QB352

2 QB219

NOMADS, INC. (NOM)

1 E5279

NORTHWEST AIRLINES, INC. (NWA)

1 E3021-E3023 E3025 E3031

QA701-QA703 QA705-QA706 QA708-QA720

QD445

2 QA746-QA753 QD447-QD449 QD453

OCCIDENTAL PETROLEUM CORP (OCP)

1 E3004

OLYMPIC AIRWAYS (OLY)

1 QA001 QA801-QA805 QB117-QB118

PAN AMERICAN WORLD AIRWAYS, INC. (PAA)

1 QA003 QA057-QA058 QA201-QA207

QA369-QA371 QA627 QA629

QA707 QA721 QA851-QA852

QB110 QB115 QB301-QB304

2 QD691-QD692 QD821-QD828

PANAMANIAN AIR FORCE (PAF)

1 E3203

PINECROFT, LIMITED (PCT)

1 E3507 QD401

PRIVATE JET EXPEDITIONS, INC. (PJE)

1 E0413

QATAR (QAT)

1 QD403

R. B. HARIRI (RBH)

2 QE002

REEVE ALEUTIAN AIRWAYS, INC. (RVV)

1 E5035 E5040

RELIANCE GROUP, INC. (RGI)

1 E3285

REPUBLIC OF CAMEROON (CMR)

1 QD410

REPUBLIC OF ZAIRE (ZAR)

1 E0214

E3034 E3039-E3040 E3173

QA722-QA723 QA725-QA745 QD441-QD443

QD711-QD717

QB309

QA209-QA214 QA216-QA225 QA366

QA635 QA637-QA640 QA704

QB001-QB002 QB101-QB104 QB107

May 4/79

Rev. 4: Jun 27/91

727-53-0149

9
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

RESBERY CORPORATION (INI)

1 E3150

RICH INTERNATIONAL AIRWAYS (RIH)

1 E3013

ROYAL AIR MAROC (RAM)

1 QA577-QA579 QA581-QA584

2 QA585

ROYAL BRUNEI (RBA)

1 E0212

2 QD407

ROYAL JORDANIAN AIRLINE (RJA)

2 QD124-QD126

ROYAL NEPAL AIRLINES (RNA)

1 E3784 E5419

ROYAL NEW ZEALAND AIR FORCE (RNZ)

1 E5065 E5068

RYAN INTERNATIONAL AIRLINES (RYN)

1 E3003 E3409 E3411

E5006 E5031-E5032 E5037

E5381 E5411 E5433

SAETA OF ECUADOR (SAE)

1 E0414 E3576

SCIBE-AIRLIFT KINSHASA (SAK)

1 E0208 E3451

SERVICIOS AEREOS NACIONALES, S.A. (SAN)

1 E3684

SHERRARD AVIATION PTY LTD. (SHD)

1 E5501

SIGAIR (SIG)

1 E0207

SKYWAYS INTERNATIONAL, INC (SKL)

1 E3421

STERLING AIRWAYS (STR)

1 QL003

2 QD164 QD427 QD684-QD685

SUN COUNTRY AIRLINES (SCA)

1 QD005

2 QB629

SYRIAN ARAB AIRLINES (SYR)

1 QD471-QD473

E3415-E3418 E5002

E5039 E5041-E5042

E5502

85 QL006-QL008

May 4/79

Rev. 4: Jun 27/91

727-53-0149

10

E5004

E5280
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

T A PORTUGUESES (TAP)

1 QD302

2 QD303-QD305

TAESA (TES)

1 E3024 E3174 E3553

TAN SAHSA HONDURAS AIRLINES (SAH)

1 E3113

THE K. B. A. FOUNDATION (KBA)

1 E3574

THE LIMITED, INC. (L11)

1 E3704

TNT-SAVA (TNN)

1 E3508 E5114

TOROSAIR (TOS)

1 QA903

TRACINDA CORPORATION (TRD)

1 E3284

TRANS WORLD AIRLINES, INC. (TWA)

1 E0401 E0405-E0408 E0412

QA501-QA527 QA529-QA537 QB201-QB203

2 QB204-QB218 QB220

E0416-E0417

TRANSPORTES AEREOS MILITAR EQUATORIANOS (TAM)

1 E3513 E3516 E3682

2 QD741

TRIANGLE AIRCRAFT SERVICES CORP. (TRI)

2 QD910

TRUMP SHUTTLE, INC. (TSI)

1 E0106 E0116

QA010-QA012 QA017-QA018

QA625-QA626

2 QD474-QD475

E0121 E0140

QA353-QA355 QA357

E3342-E3343

QA606

TUNIS AIR (TUN)

1 QA571 QB401-QB407

TUR EUROPEAN AIRWAYS (TOU)

1 QB119 QB306

TURKISH AIRLINES (THY)

1 QD321-QD322 QD324-QD325

2 QD327-QD330 QD511

UNITED AIR LINES, INC. (UAL)

1 E0003 E0005-E0022

2 QA469-QA499 QB701-QB705

QA401 -QA468

May 4/79

Rev. 4: Jun 27/91

727-53-0149

11

E0419 E0423

E3349

QA623
LISTING BY CUSTOMER, CUSTOMER CODE, GROUP AND VARIABLE NUMBER, (continued)

CUSTOMER

GROUP VARIABLE NUMBER

UNITED PARCEL SERVICE (UPS)

1 E5033-E5034 E5036 E5038 E5043-E5045 E5051

E5109-E5111 E5113 E5115-E5116 E5162 E5225

E5251-E5252 E5271 E5275-E5276 E5301-E5306 E5401

E5417 E5422-E5423 E5427 E5429 QA927

2 QA934-QA938

UNITED STATES MARSHAL'S SERVICE (USV)

1 E0215 E3059

USAF - 727 C-22A PROGRAM (U05)

1 E0203

USAF - 727 C-22B PROGRAM (U06)

1 E3061 E3063 E3066-E3067

USAIR, INC. (USA)

1 QA005-QA009 QA023 QA026-QA032 QA051-QA056 QA358

QA367-QA368 QA372-QA373 QA928

2 QA374-QA376 QB066-QB068 QB618 QB620-QB621 QB623

USAL, LTD. (ULL)

1 E3523

VALLEJO CORPORATION (VAC)

1 E3683

VARIG AIRLINES (VAR)

11 E3572 E3575 E3751-E3754 E5272 E5406-

VIEW TOP CORPORATION (VTC)

11 E3006

WEDGE AVIATION, INC (WST)

2 QE001

WESTFIELD AVIATION LTD. (WEF)

1 E0350

WORLDWAYS CANADA LTD (WWC)

1 E3601-E3603

YEMEN AIRWAYS (YEM)

2 QD621-QD624 QD641

May 4/79

Rev. 4: Jun 27/91

E5106-E5107

E5243-E5245

E5405

QD551-QD552

QA360-QA365

QD681-QD683

E5407 E5412

727-53-0149

12
LISTING BY VARIABLE NUMBER

GROUP 1

E0001-E0042

E3011-E3014

E3141-E3152

E3401-E3421

E3571-E3578

E3701-E3704

E5141-E5143

E5301-E5306

E5435

QA101-QA178

QA501 -QA537

QA851-QA899

QB121-QB149

QB451-QB453

QD085-QD088

QD201-QD214

QD410

QD601 -QD602

GROUP 2

QA179-QA199

QA746-QA753

QB204-QB220

QB801-QB810

QD164

QD446-QD453

QD603-QD607

QD701-QD702

QD801-QD804

QE001-QE002

E0101-E0140

E3021-E3040

E3171-E3177

E3451-E3452

E3601-E3604

E3751-E3755

E5161-E5164

E5351-E5353

E5451-E5455

QA201-QA225

QA551 -QA579

QA901-QA933

QB151-QB153

QB501-QB552

QD101-QD105

QD281-QD284

QD421-QD423

QD901-QD906

QA345-QA349

QA934-QA946

QB316

QB901-QB904

QD215-QD239

QD474-QD475

QD621-QD624

QD711-QD717

QD821-QD828

QL006-QL008

E0201-E0216

E3059

E3201-E3206

E3471-E3474

E3621-E3622

E3781-E3784

E5201-E5203

E5381-E5382

E5481-E5483

QA301-QA344

QA581-QA584

QB001-QB002

QB201-QB203

QB601-QB609

QD121-QD123

QD301-QD302

QD441-QD445

QD931-QD932

QA374-QA376

QA949

QB454-QB458

QD009-QD012

QD303-QD305

QD510-QD518

QD641

QD741

QD907-QD910

QL081

E0301-E0351

E3061-E3077

E3221-E3224

E3501-E3513

E3651-E3655

E5001-E5011

E5221-E5245

E5401-E5424

E5501-E5502

QA351-QA373

QA601-QA656

QB031-QB045

QB301-QB315

QB651

QD141-QD145

QD321-QD326

QD471-QD473

QD951

QA469-QA499

QB046-QB049

QB553-QB575

QD039-QD046

QD327-QD330

QD555-QD558

QD661-QD663

QD761-QD769

QD952-QD954

QL501-QL515

E0401-E0423

E3101-E3103

E3241-E3290

E3516-E3523

E3677

E5031-E5068

E5251-E5252

E5426-E5429

QA001-QA046

QA378

QA701-QA745

QB101-QB110

QB351-QB352

QD001-QD008

QD161-QD163

QD351

QD501-QD509

QL001-QL005

QA585

QB051-QB068

QB610-QB629

QD124-QD127

QD407

QD571-QD572

QD681-QD685

QD781-QD782

QD971-QD973

E3001-E3006

E3111-E3118

E3341-E3350

E3551-E3553

E3681-E3684

E5101-E5116

E5271-E5281

E5433

QA051 -QA099

QA401-QA468

QA801-QA805

QB114-QB119

QB401 -QB407

QD031-QD038

QD191-QD192

QD401-QD403

QD551-QD554

QL031-QL032

QA657-QA688

QB154-QB158

QB701-QB705

QD146-QD149

QD424-QD427

QD581-QD583

QD691-QD692

QD791

QD991-QD992

2. Spares

None

May 4/79

Rev. 4: Jun 27/91

727-53-0149

13
B. Reason

As a result of the FAA-sponsored Aging Fleet Conference, a 727 Structures Working Group with

Airline and Boeing members and FAA observers was formed to review structural service bulletin

modifications and recommend selected bulletins for incorporation on aging airplanes. This service

bulletin modificaton has been recommended for incorporation on aging 727 airplanes.

Incorporation of the modification described in this bulletin will reduce the possibility of cracks in the

main wheel well pressure floor adjacent to the floor beams at Body Stations 880, 890, 930, 940 and

950. Propagation of undetected cracks could result in pressurization difficulties.

Eight operators have reported 34 cracks on 20 airplanes along the ends of the pressure floor

reinforcing beads at Stations 930 and 940. The cracks ranged from 0.38 to 15.25 inches in length.

The airplanes had accumulated between 24,000 and 42,200 flight cycles and 24,000 and 49,500

flight hours.

Since Revision 3 of this service bulletin, similar cracks have been reported at Body Station 950.

Although there have been no reports of cracking at Stations 880 and 890, the possibility exists that

cracks may develop at these stations also. A preventive modification and repair for cracking at

wheel well pressure web Stations 900 through 920 is described in Service Bulletin 727-53-124.

Revision 1 was issued to provide detailed instructions for cutting and splicing fiberglass air

conditioning ducts to allow access to rework area without removing aft body fuel tanks. Some of the

ducts are made of polycarbonate and may not be cut and spliced. The splicing procedure is

required only when aft body tanks are installed and it is not feasible to remove them. In all other

instances, to minimize airplane downtime, entire duct should be removed during rework.

Subsequent to the issue of Revision 1 of this service bulletin operators requested an interim crack

repair similar to that contained in Service Bulletin 727-53-124. In addition, one operator reported

cracks beyond repairable limits contained in repair drawings included with this bulletin. Therefore,

Revision 2 was issued to allow an optional interim repair for cracks within limits and to transmit

revised drawings providing for expanded repairs in certain areas. Several previous kits have been

replaced to account for expanded repairs.

Revision 3 of this bulletin is issued to provide the recommendations of the Aging Fleet 727

Structures Working Group. Also provided is an additional modification kit to install a 0.100 inch

thick doubler between Body Station 920 and Body Station 950 and between Buttock Line 50 and

side of body on both left and right sides of airplane.

Revision 4 of this bulletin is issued to provide information about a new top kit and new supplemental

kits. The new top kit provides two doublers to cover the same area as the doubler provided in

Revision 3 of this bulletin. The doublers 65-89360-129 and -130, provided by Revision 3 require

rework to make two doublers 65-89360-137 and two doublers 65-89360-138. The new revision to

the drawing added information for installation of the doubler if existing repairs are at the same

location. The inspection area is expanded to examine the beads at Body Station 950. Also an

inspection threshold and a repeat inspection interval are added for all areas not repaired or

preventively modified as described in Part III of the Accomplishment Instructions. The intent of

727-53-0149NSC1 and 727-53-0149NSC2 are also added.

MaY 4//79 727-53-0149

Rev. 4: Jun 27/91 14
C. Description

Based on a structural review of the 727 airplane, it is recommended that the modification per Accomplishment Instructions of this service bulletin be accomplished prior to, or upon accumulation

of 60,000 flight cycles.

When the airplane has 20,000 flight cycles, or within the next 2500 cycles, whichever is later, inspect the ends of the pressure floor beads adjacent to Stations 880, 890, 930, 940 and 950. If the

previous inspection is High Frequance Eddy Current, examine at 5000 flight cycle intervals. If the

previous inspection is visual or dye penetrant, examine at 4000 flight cycle intervals. Repeat inspection until preventive modification or permanent repair is accomplished. Eddy-current or

penetrant inspection is the preferred method of crack detection.

Preventive modification consists of addition of reinforcing strips along each inspected floor beam

and replacement of one stiffener between Stations 870 and 880. In addition, doublers are installed

between Body Station 920 and 950 and between right Buttock Line (BL) 50 and side of body and

left BL 50 and side of body. Cracks may be repaired in specified areas by adding doublers and

reinforcing strips. An interim repair consisting of stop drilling and sealing of cracks within limits may be accomplished providing the permanent repair is made within 600 flights thereafter. The

preventive modification should be accomplished in unrepaired areas.

On airplanes that have Permanent Repair (shown in Figure 2) or Preventive Modification (shown in

Figure 3) installed in one or part of the specified areas, inspect all remaining specified areas. If the

previous inspection is High Frequance Eddy Current, examine at 5000 flight cycle intervals. If the

previous inspection is visual or dye penetrant, examine at 4000 flight cycle intervals. Repeat inspection until Permanent Repair or Preventive Modification is installed.

Airplanes previously modified per the original issue, or Revisions 1 or 2 of this bulletin, or Group 2

airplanes require repeat inspection for cracks in the pressure floor web at Body Stations 930, 940

and 950 between Buttock Lines (BL) 50 and side of airplane body until additional doublers are

installed per Revision 3 or this revision.

Airplanes previously repaired per the original issue, or Revisions 1, 2 or 3 of this bulletin using blind

fasteners require additional work to replace fasteners after 10,000 flight cycles.

This service bulletin is the subject of Federal Aviation Administration (FAA) Airworthiness Directive

90-17-06 Amendment 39-6691 which supersedes existing FAA Airworthiness Directive 88-26-02, Amendment 39-6089.

NOTE: 1. If not already accomplished, concurrent incorporation of Service Bulletin 727-53-124, "Main Wheel Well Pressure Floor Inspection, Modification and Repair", is suggested on

commonly affected airplanes.

2. This service bulletin is listed in Boeing Document D6- 54860.

D. Approval

This service bulletin has been reviewed by the Federal Aviation Administration (FAA) and the

repairs and modifications herein comply with the applicable Federal Aviation Regulations (FAR's) and are FAA approved.

The FAA has determined that repair and modification in accordance with Revision 4 to service

bulletin 727-53-0149 "FUSELAGE - MAIN WHEEL WELL PRESSURE FLOOR INSPECTION, MODIFICATION AND REPAIR" provides an acceptable alternate means of compliance for FAA

Airworthiness Directive 90-17-06, Amendment 39-6691 which supersedes existing FAA

Airworthiness Directive 88-26-02, Amendment 39-6089.

May 4/79 727-53-0149

Rev. 4: Jun 27/91 15
E. MaNpower

Approximately 274 man-hours are necessary to do this modification for each airplane.

The data below shows an estimate of the man-hours necessary to do this modification for each

airplane. This estimate is for direct labor only, done only by an experienced crew. Adjust these

estimates with operator man-hour data if necessary. It does not include lost time such as: time to

adjust to the work place; schedule the work; examine the work; cure materials; make parts; find

tools or other lost time.

Elapsed

Number of Time

Task Persons Man-Hours (Hours)

Examine 2 2 1

Open Access for Change 8 40 5

Change 6 162 27

Close Access 8 72 9

NOTE: Additional time may be necessary to do repair during modification. Repair time will vary

depending on extent of repair.

May 4/79

Rev. 4: Jun 27/91

727-53-0149

16
F. Material - Price and Availability

1. 1. The modification kit identified in Paragraph II.A. may be obtained from Boeing within the

terms and conditions defined below. After expiration of the quotation, price and delivery data

will be provided upon request.

The delivery quotation below is computed from date of receipt of customer purchase order.

Improved flow times may be possible if necessary to support customers' planned modification

schedules. It is therefore requested that customer purchase orders requiring earlier kit delivery include planned dates of kit incorporation.

Kit Number Description

Delivery

Weeks Unit Price

Modification

Kit

Modification

Kit

Modification

Kit (Group 1)

Inactive for

procurement

Inactive for

procurement

25 $5565.00

65-89360-127 Doubler Kit - Inactive for

procurement

69-70864-5

69-70864-3

Modification Kit

(Group 2)

Kit- Supplements

69-70864-2

21 $3624.00

20 $3282.00

Date: June27,1991

May 4/79

Rev. 4: Jun 27/91

727-53-0149

17

69-70864-1

69-70864-2

69-70864-4
2. It is recommended that the repair kits identified in Paragraph II.A. be furnished or fabricated

from operator's existing stock or purchased directly from industry sources. The following

Boeing price data is provided for planning purposes or in the event operators desire to purchase

kits from Boeing. Delivery data will be provided upon request.

Kit Number

65-89360-71

65-89360-72

65-89360-73

65-89360-74

65-89360-75

65-89360-76

65-89360-77

65-89360-78

65-89360-79

65-89360-81

65-89360-82

65-89360-85

65-89360-86

65-89360-103

65-89360-104

65-89360-105

65-89360-106

Date: June 27. 1991

Description

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Repair Kit

Unit Price

Inactive for Procurement

Inactive for Procurement

Inactive for Procurement

Inactive for Procurement

$304.00

$304.00

$179.00

$179.00

$196.00

$213.00

$180.00

$191.00

$188.00

$860.00

$860.00

$901.00

$901.00

The prices quoted are subject to the terms and conditions of Boeing's standard purchase order

acknowledgment. Quotations are subject to acceptance within 180 days from date hereon.

Prices quoted in United States Dollars. Terms: Net 30 days.

Address purchase orders and correspondence pertaining to this quotation to Director of Spares,

and refer to this service bulletin number.

May 4/79

Rev. 4: Jun 27/91

727-53-0149

18
G. Tooling - Price and Availability

None

H. Weight and Balance (Modification Only)

Applicability

69-70864-2

69-70864-3

69-70864-4

69-70864-5

65-89360-127

Change in Basic Weight

Pounds

+24.5

+3.3

+23.2

+11.3

+10.2

Change in Basic Moment

Pound-Inches

+22,662

+3069

+21460

+10509

+9,486

May 4/79

Rev. 4: Jun 27/91

727-53-0149

19
I. References

1. Existing Data

a. Engineering Change Memo PRR 24311

b. Structural Repair Manual Subject 51-30-2 and 51-30-5

c. 727 Overhaul Manual Subject 20-50-12

d. Boeing Service Bulletin 727-53-124, 'Main Wheel Well Pressure Floor Inspection,

Modification and Repair"

e. FAA Airworthiness Directive 90-17-06, Amendment 39-6691

f. Boeing Document D6-54860 "Aging Airplane Service Bulletin Structural Modification

Program - Model 727"

2. New or revised data supplied with this service bulletin:

Drawina No. Sht. DCN ADCN Title

65-89360 PL D - Doubler Installation -

Pressure Floor Main

5 A 8 Gear Wheel well

6 - 2

7

8 A

9 A

3. Process Data:

Boeing Process Specifications that are listed on drawings supplied in support of this bulletin are

not detailed in this bulletin since they are common practices which can be accomplished in

accordance with operator's normal procedures.

J. Publications Changed

Publication Chapter-Section

727 Structural Repair Manual 53-10-02

May 4/79

Rev. 4: Jun 27/91

727-53-0149

20
II. MATERIAL INFORMATION

A. Parts Required Per Airplane

1. The following modification kit may be obtained from Boeing as noted in Paragraph I.F.:

NOTES:

1. Only one top kit is required to modify each airplane.

2. On Group 2 airplanes or group 1 airplanes previously modified per the original issue, Revision 1 or 2 of this bulletin only require the Modification Kit 69-70864-5.

3. For operators that have ordered 65-89360-127 kit per Revision 3 of this bulletin

only require the supplemental Kit 69-70864-3.

4. For contents of kits refer to drawings supplied with this service bulletin.

69-70864 - REINFORCEMENT INSTALLATION, PRESSURE FLOOR, MAIN GEAR WHEEL

WELL

-5 -4 -3 -2 -1

Part Number

69-70864-1 (a)(b)

69-70864-2 (a)(c)

69-70864-3 (c)(d)

69-70864-4 (a)(b)(c)

69-70864-5 (b)(d)

1 1 65-89360-83

1 . 65-89360-127 (b)

65-89360-135

65-89360-136

1 1 65-89619-1

Nomenclature

Top Kit (Inactive)

Top Kit (Inactive)

Supplemental Kit

Top Kit (Group 1)

Top Kit (Group 2)

Reinforcement

Installation

Doubler Installation

Doubler Installation

Doubler Installation

Support Bracket

Installation

(a) Top Kit 69-70864-4 supersedes 69-70864-2 and 69-70864-1.

(b) Kit 69-70864-1 plus Kit 65-89360-127 plus Kit 69-70864-3 is equivalent to 69-70864-4; also

Kit 69-70864-1 plus kit 69-70864-5 is equivalent to 69-70864-4

(c) Kit 69-70864-2 plus Kit 69-70864-3 is equivalent to 69-70864-4

(d) Kit 65-89360-127 plus Kit 69-70864-3 is equivalent to 69-70864-5, after rework of doublers

65-89360-129 and 65-89360-130 to two 65-89360-137 doublers and two 65-89360-138

May 4/79 727-53-0149

Rev. 4: Jun 27/91 21

Quantity

1

1 1

1

1-
doublers.

2. The following repair kits may be furnished by the operator or obtained from Boeing as noted in

Paragraph I.F.:

NOTE: For contents of kits refer to drawings supplied with this service bulletin.

65-89360 - DOUBLER INSTALLATION, PRESSURE FLOOR MAZN GEAR WHEEL WELL

-73 -72 -71

Part Number

65-89360-71 (a)

65-89360-72(b)

65-89360-73(c)

Nomenclature

Repair Kit- Left,

Sta 920-930, BL32-58

Repair Kit- Right,

Sta 920-930, BL32-58

Repair Kit- Left,

Sta 930-940, BL32-55

(a) Superseded by 65-89360-105

(b) Superseded by 65-89360-106

(c) Superseded by 65-89360-103

65-89360 - DOUBLER INSTALLATION, PRESSURE FLOUR MAIN GEAR

WHEEL WELL

-76 -75 -74

Quantity Part Number

65-89360-74(d)

65-89360-75

65-89360-76

Nomenclature

Repair Kit- Right,

Sta 930-940, BL32-55

Repair Kit- Left,

Sta 930-940, BL20-32

Repair Kit -Right,

Sta 930-940,BL20-32

(d) Superseded by 65-89360-104

May 4/79

Rev. 4: Jun 27/91

Quantity

727-53-0149

22
BOEING SERVICE BULLETIN 727-53-0149

65-89360 - DOUBLER INSTALLATION, PRESSURE FLOOR MAIN GEAR WHEEL

WELL

-79 -7 8 -7 7

Part Number

65-89360-77

65-89360-78

65-89360-79

Nomenclature

Repair Kit -Left,

Sta 930-940, BL2-12

Repair Kit -Right

Sta 930-940, BL2-12

Repair Kit -Left,

Sta 920-930, BL2-16

65-89360 - DOUBLER INSTALLATION, PRESSURE FLOOR MAIN GEAR

WHEEL WELL

-86 -85 -82 -81

Part Number

65-89360-81

65-89360-82

65-89360-85

65-89360-86

Nomenclature

Repair Kit -Left,

Sta 880-890, BL 0-22

Repair Kit -Right,

Sta 880-890, BL 0-12

Repair Kit -Left,

Sta 890-900, BL 0-22

Repair Kit -Right,

Sta 890-900, BL 0-15

May 4/79

Rev. 4: Jun 27/91

Quantity

Quantity

727-53-0149

23
65-89360 - DOUBLER INSTALLATION, PRESSURE FLOOR MAIN GEAR

WHEEL WELL

-106 -105 -104 -103

Part Number

- 65-89360 -103(e)

65-89360 -104(f)

65-89360 -105(g)

65-89360 -106(h)

Nomenclature

Repair Kit- Left

Sta 930 - 940, BL 32-61

Repair Kit- Right

Sta 930 - 940, BL 32-61

Repair Kit- Left

Sta 920 - 930, BL 32-61

Repair Kit- Right

Sta 920 - 930, BL 32-61

(e) Supersedes 65-89360-73

(f) Supersedes 65-89360-74

(g) Supersedes 65-89360-71

(h) Supersedes 65-89360-72

May 4/79

Rev. 4: Jun 27/91

727-53-0149

24

Quantity
3. The following materials are to be supplied by the operator for airplanes with aft body fuel tanks

installed (See Figure 5 for requirements):

Quantity

As Required

As Required

As Required

As Required

As Required

As Required

As Required

As Required

As Required

As Required

As Required

Part Number

R110 (a)

R110 (a)

BMS 9-3 (b)

(c)

(c)

BMS 8-39, Type I (d)

Composition A

BMS 8-39, Type IV (d)

Composition A

Type 12 (e)

Type 48 (e)

Schnee Moorhead

No. 5144 (f)

Foster 9B2 (g)

BMS 8-201, Type I (h)

BMS 8-201,Type II (h)(i)

Nomenclature

Resin Mix

Resin Mix

181 Fabric

Polyvinylchloride (PVC)

Polyvinylalcohol (PVA)

Insulation

Insulation

Adhesive

Adhesive

Sealing Compound

Sealing Compound

Resin

Resin

(a) See Bac 5419 for sources of components of resin mix R110 or R111.

(b) BFG Industries, Inc.

P.O. Box 21207

3330 West Friendly Ave.

Greensboro, NC 27420

Clark-Schwebel Fiber Glass Corp.

P.O. Box 2627

2200 South Murray Avenue

Anderson, SC 29622

6M825

Clark-Schwebel

International S.A.

Battice, Belgium V

B1353

Hexcel Corporation

11711 Dublin Blvd.

Dublin, CA 94566

04621

(c) Reynolds Metals Company

2819 First Avenue

Seattle, WA 98121

May 4/79

Rev. 4: Jun 27/91

727-53-0149

25
(d) General Plastics Manufacturing Company

P.O. Box 9097

Tacoma, WA 98409

28014

Scotfoam Corporation

1500 East 2nd. Street

Chester, PA 19013

(e) See 727 Overhaul Manual Subject 20-50-12.

(f) Schnee Moorehead

Chemicals, Inc.

Irving, TX 75060-3153

53309

(g) Atacs Products Inc.

1120 SW 16th

Renton, WA 98055

61426

(h) Furane Products Company

5121 San Fernando Road West

Los Angles, CA 90039

(i) Ren Plastics

A Ciba-Geigy Company

4917 Dawn Avenue

East Lansing, MI 48823-2821

02684

B. ParTs Required to Modify Spares

None

C. Special Tools and Equipment Required

None

May 4/79

Rev. 4: Jun 27/91

727-53-0149

26
D. Existing Parts Accountability

The parts shown below are changed by this service bulletin.

changed on the airplane.

Quantity (Qty) is the number of parts

Existing

Part Number

69-14165-1

69-14165-2

69-14165-3

69-14172-1

65-26122-1

65-26122-2

65-28410-1

65-28410-2

65-28410-7

65-28410-8

Part

Name

Bracket Assembly

Bracket Assembly

Bracket Assembly

Bracket Assembly

Bracket Quadrant

Bracket Quadrant

Bracket Assembly

Bracket Assembly

Bracket Assembly

Bracket Assembly

Quantity

1

1

1

1

1

1

1

1

1

1

RUC

DIS

DIS

DIS

DIS

RWK

RWK

RWK

RWK

RWK

RWK

New Part

Number

69-66838-1

69-66838-2

69-66838-3

69-66838-4

65-89360-149

65-89360-150

65-89360-151

65-89360-152

65-89360-151

65-89360-152

RUC Recommend Use Code

DIS - Discard the part.

RWK - Make the change as specified in this service bulletin.

PNC Part Number Code

N - There is no equivalent Boeing part number for the changed

part. Show on the part that this service bulletin has been

done.

S - New equivalent or replacement part number.

RC Replacement Code

A - Not Interchangeable: Do not replace one part with the

other.

May 4/79

Rev. 4: Jun 27/91

727-53-0149

27

PNC

S

S

S

S

N

N

N

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III. ACCOMPLISHMENT INSTRUCTIONS

NOTES: 1. The paragraphs identified with letters give the general work instructions and the necessary

tests. The instructions identified with numbers on the figures give the recommended

sequence of operations.

2. As stated in Paragraph I.D. interim crack repairs specified in Part II below are FAA

approved contingent upon accomplishment of permanent repair per Part III or inspection

as noted.

3. As recommended by the 727 Aging Fleet Structures Working Group, accomplish the

modification per this service bulletin, Part IV of the Accomplishment instructions prior to or

upon the accumulation of 60,000 flights.

Part I - Inspection

A. Inspect lower surface of pressure floor adjacent to Body Stations 880, 890, 930,940 and 950 for

cracks in the left and right main wheel wells per Figure 1.

B. If no cracks are found, accomplish preventive modification per Part IV or repeat inspection per Paragraph A above at maintenance intervals as shown in Paragraph I.C. Description, until

Accomplishment Instructions Part IV Preventive Modification or Part III Permanent Repair is

accomplished.

C. On airplanes previously modified per the original issue, or Revisions 1or 2 of this bulletin or all

Group 2 airplanes, inspect for cracks in main wheel well pressure floor at Body Stations 930,940 and

950 between left and right Buttock Line (BL) 50 and side of body per Figure 1.

D. If no cracks are found per Paragraph C above, accomplish doubler installation per Figure 3 Circle

Note 5 and Drawing 65-89360 Sheet 8 and 9, or repeat inspection per Paragraph C above at

maintenance intervals as shown in Paragraph I.C. Description, until Accomplishment Instructions

Part IV Preventive Modification or Part III Permanent Repair is accomplished.

E. If cracks are found per Paragraphs A. or C. above, do Interim Repair per Part II or Permanent Repair

per Part III.

F. On airplanes that have Permanent Repair (shown in Figure 2) or Preventive Modification (shown in

Figure 3) installed in one or part of the specified areas, inspect all remaining specified areas at

maintenance intervals as shown in Paragraph I.C. Description, until Permanent Repair or Preventive

Modification is installed in all areas.

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Part II - Interim Repair (optional):

If cracks are found which do not exceed limits specified in Table I, stop drill cracks with 0.190 inch

diameter drill, apply pressure and environmental sealant per operator's standard procedures and

accomplish permanent repair per Part III within 600 flights.

TABLE I

Crack Limits

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Part III - Permanent Repair:

If cracks are found, accomplish the following:

A. Gain access to upper surface of pressure floor by removing equipment and floor panels per operator's standard procedure.

B. On affected airplanes prior to Line Position 1358, gain access to lower surface (if required along inboard edge) by removing wheel well ducts per operator's standard procedure (Ref. 727

Maintenance Manual Subject 21-20-4). Affected airplanes Line Position 1358 and on do not have

ducts in this area.

NOTE: If airplane is equipped with aft body fuel tanks, the tanks must be removed per operator's

standard procedure (Ref. 727 Maintenance Manual Subject 53-20-31) to allow duct

removal. The inner ducts are made from either a polycarbonate or a fiberglass material.

Instead of tank removal, the fiberglass ducts may be cut (to provide access) and spliced (after rework) per Figure 5. Polycarbonate ducts may not be cut and spliced. Inner duct

material may be checked from above by removing floor panel over duct at Station 960.

Identify type of duct installed as follows:

1. Polycarbonate material has the look of extruded plastic. It is usually black or gray with a

smooth finish. PVC Pipe is a typical example of extruded smooth plastic.

2. Fiberglass is generally light green with a rougher texture due to a cloth lay-up with resin.

The ram air inlet ducts are a typical example of fiberglass ducts.

C. Stop drill each end of cracks with No. 11 (0.191 inch diameter) hole. Eddy current inspect to confirm

crack containment. If so, increase hole size with 1/4-inch drill to 0.250 inch diameter.

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D. Remove required fasteners, clips and brackets and install repair parts per Figure 2.

NOTES: 1.Shorter or longer doublers than those included in the kits and shown on Drawing

65-89360 may be installed as a repair.

2. If existing repair doubler interferes with new repair, it will be necessary to remove the

existing repair doubler and install a new repair that covers both areas.

3. If expedited repair is required, the repair parts may be installed, without gaining access

to the upper surface of the pressure floor, with blind bolts, BACB30LB( )-( ), or Visu-Lok

PLT210 blind bolts, at all fastener locations. If blind fasteners are installed, however, they

must be inspected when the airplane has 3000 cycles after installation and at intervals

of approximately 2,500 flight cycles until replaced with fasteners specified on Drawing

65-89360, at or prior to 10,000 flight cycles since installation of the blind bolts. Install

blind bolts per 727 Structural Repair Manual Subject 51-30-2 and 51-30-5 -Hole sizes for

installation of blind bolts are specified in Table II.

4. Airplanes previously repaired using blind fasteners that have accumulated 10,000 flight

cycles, should replace the blind fasteners with solid fasteners per drawing 65-89360,

within 3,000 flights after receipt of this Revision 3.

TABLE II

Hole Size (in inches) for Installation of Blind Bolts

Hole Size

Nominal Standard

Fastener PLT210

Size BACB30LB( )-()

3/16 0.199 to 0.202

1/4 0.260 to 0.263

E. Installl preventive modification straps and doublers per Figure 3 in all remaining specified areas not

repaired, or inspect all remaining specified areas not repaired at maintenance intervals as shown in

Paragraph I.C. Description, until Permanent Repair or Preventive Modification is installed in all

specilied areas.

F. Replace tubing brackets specified in Figure 4 and reinstall remaining clips and brackets.

G. Finish reworked areas to match surrounding areas per operator's standard procedure.

H. Return airplane to operating configuration

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Part IV - Preventive Modification

Accomplish preventive modification as follows:

A. Gain access to upper surface of pressure floor by removing equipment and floor panels per operator's standard procedure.

B. On affected airplanes prior to Line Position 1358, gain access to lower surface by removing wheel

well ducts per operator's standard procedure (Ref. 727 Maintenance Manual Subject 21-20-4). Affected airplanes Line Position 1358 and on do not have ducts in this area.

NOTE: If airplane is equipped with aft body fuel tanks, the tanks must be removed per operator's standard procedure (Ref. 727 Maintenance Manual Subject 53-20-31) to allow duct

removal. The inner ducts are made from either a polycarbonate or a fiberglass material.

Instead of tank removal, the fiberglass ducts may be cut (to provide access) and spliced (after rework) per Figure 5. Polycarbonate ducts may not be cut and spliced. Inner duct

material may be checked from above by removing floor panel over duct at Station 960.

Identify type of duct installed as follows:

1. Polycarbonate material has the look of extruded plastic. It is usually black or gray with a

smooth finish. PVC pipe is a typical example of extruded smooth plastic.

2. Fiberglass is generally light green with a rougher texture due to a cloth lay-up with resin.

The ram air inlet ducts are a typical example of fiberglass ducts.

C. Remove required fasteners, clips and brackets and modify per Figure 3.

NOTE: On airplanes previously modified by instructions in the original issue or Revisions 1 or 2 and

group 2 airplanes not modified by instructions in Revision 3 require installation of doublers

65-89360-137 and 65-89360-138 per Figure 3 circle note 5 or 6.

D. Replace tubing brackets specified in Figure 4 and reinstall remaining clips and brackets.

E. Finish reworked area to match surrounding area per operator's standard procedure.

F. Return airplane to operating configuration.

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Illustration Table of Contents

Title Page

Figure 1. Inspection 33

Figure 2 . Crack Repair 35

Figure 3. Preventive Modification 37

Figure 4. Tubing Bracket Replacement 47

Figure 5. Air Conditioning Duct Cutting and Splicing 49

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FIGURE 1. INSPECTION

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FIGURE 1. INSPECTION

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FIGURE 2. CRACK REPAIR

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FIGURE 2. CRACK REPAIR

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 3. PREVENTIVE MODIFICATION

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FIGURE 4. TUBING BRACKET REPLACEMENT

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FIGURE 4. TUBING BRACKET REPLACEMENT

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FIGURE 5. AIR CONDITIONING DUCT CUTTING AND SPLICING

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FIGURE 5. AIR CONDITIONING DUCT CUTTING AND SPLICING

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FIGURE 5. AIR CONDITIONING DUCT CUTTING AND SPLICING

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SUBJECT: FUSELAGE - MAIN WHEEL WELL PRESSURE FLOOR INSPECTION, MODIFICATION

AND REPAIR

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NOTE: Please do not use this evaluation form to tell us to make changes to your maintenance or

repair manuals. To make these changes, please use a Publication Change Request (PCR) form.

Give the completed evaluation form to your Boeing Field Service Representative or send the evaluation form directly to this address:

R.G. Kelsey

Manager

Service Bulletin Engineering

Boeing Commercial Airplane Group

P.O. Box 3707, Mail Stop 2L-02

Seattle, WA 98124-2207

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