# Boeing Alert Requirements Bulletin 737-53A1403 RB: No revision named

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- Title as filed: RB 737-53A1403-RB-00--
- Pages: 26
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## Text

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### Page 1

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-53A1403 RB
Original Issue: August 26, 2021
ATA System: 5311
SUBJECT: FUSELAGE - Frames and Bulkheads - STA 1016 Aft Pressure Bulkhead - 0.040 Inch
Dome Apex Web Lap Splice Inspection
Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15
CFR 300-774). 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:
Copyright © 2021 Boeing.
Unpublished Work. All Rights Reserved.
Treatment of this document and its content is governed by contract with Boeing. Rights to use this document
are licensed on a per aircraft basis and such rights may not be transferable. For more information, contact The
Boeing Company.
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, KC-46, KDC-10, MD-10, MD-11, MD-80, MD-88, MD-90, P-8, Poseidon and
Boeing liveries 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.
Original Issue: August 26, 2021
737-53A1403 RB
1 of 26
4.0

### Page 2

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
2 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT
BLANK PAGE

### Page 3

Table of Contents
1. EFFECTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
A. Airplanes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
B. Spares Affected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2. CONCURRENT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. APPROVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. ACCOMPLISHMENT INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
A. General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
B. Work Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FIGURE 1: AFT PRESSURE BULKHEAD (APB) - GENERAL VISUAL INSPECTION . . . . . . . . . 21
FIGURE 2: AFT PRESSURE BULKHEAD (APB) - WEB LAP SPLICE INSPECTION AREAS . . . . . 24
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
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REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT

### Page 4

Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
4 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT
BLANK PAGE

### Page 5

Commercial 
Airplanes
737
Requirements Bulletin
ALERT
Number: 737-53A1403 RB
Original Issue: August 26, 2021
ATA System: 5311
SUBJECT: FUSELAGE - Frames and Bulkheads - STA 1016 Aft Pressure Bulkhead - 0.040 Inch
Dome Apex Web Lap Splice Inspection
THIS DOCUMENT 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 DOCUMENT
TO THE NEW OPERATOR. IF APPLICABLE SPARES HAVE BEEN SOLD, SEND THIS DOCUMENT TO THE
NEW OWNER. THIS IS AN ENHANCED REQUIRED FOR COMPLIANCE DOCUMENT. THE BOEING
PROCESSES USED TO CREATE THE SERVICE BULLETIN (SB) AND THE REQUIREMENTS BULLETIN
(RB) ENSURE THAT THE INFORMATION BETWEEN "RC START" AND "RC END" IN THE SB ARE IDENTICAL
TO THE INFORMATION IN THE SAME SECTIONS (COMPLIANCE, WORK INSTRUCTIONS…) OF THE RB
WHICH THE SB REFERS TO AS THE RELATED DOCUMENT.
1. Effectivity
A. Airplanes
This bulletin is applicable to 737-600, 737-700, 737-700C, 737-800, 737-900 Airplane(s), line
number(s) 1756-1980, 1982-2092, 2094, 2096-2161, 2163-2224, 2226-2252, 2254-2284, 2286-2288,
2290-2318, 2320-2348, 2350-2394, 2396-2425, 2427-2436, 2438-2449, 2451-2454, 2456-2460,
2462-2465, 2467-2473, 2475-2478, 2480-2484, 2486-2489, 2491-2503, 2505-2509, 2511-2515,
2517-2521, 2523-2527, 2529-2540, 2542-2546, 2548-2552, 2554-2558, 2560-2564, 2566-2570,
2572-2576, 2578-2583, 2585-2589, 2591-2595, 2597-2598, 2600-2607, 2609-2613, 2615-2620,
2622-2632, 2634-2638, 2640-2644, 2646-2650, 2652-2656, 2658-2663, 2665-2669, 2671-2675,
2677-2693, 2695-2700, 2702-2706, 2708-2721, 2723-2724, 2726-2730, 2732-2736, 2738-2743,
2745-2749, 2751-2755, 2757-2761, 2763-2773, 2775-2786, 2788-2792, 2794-2813, 2815-2816,
2818-2823, 2825-2829, 2831-2835, 2837-2841, 2843-2847, 2849-2866, 2868-2878, 2880-2890,
2892-2896, 2898-2903, 2905-2909, 2911-2915, 2917-2927, 2929-2930, 2932-2933, 2935-2941,
2943-2946, 2948-2952, 2954-2958, 2960-2964, 2966-2970, 2972-2976, 2978-2983, 2985-2989,
2991-2995, 2997-3001, 3003-3007, 3009-3013, 3015-3026, 3028-3032, 3034-3056, 3058-3068,
3070-3074, 3076-3080, 3082-3092, 3094-3099, 3101-3104, 3106-3110, 3112-3116, 3118-3122,
3124-3128, 3130-3134, 3136-3152, 3154-3158, 3160-3165, 3167-3170, 3172-3176, 3178-3182,
3184-3200, 3202-3206, 3208-3212, 3214-3218, 3220-3224, 3226-3242, 3244-3248, 3250-3278,
3280-3284, 3286-3296, 3298-3302, 3304-3314, 3316-3320, 3322-3323, 3325-3326, 3328-3332,
3334-3340, 3342-3344, 3346-3352, 3354-3365, 3367-3369, 3371-3374, 3376-3380, 3382-3384,
3386-3388, 3390-3392, 3394-3398, 3400-3404, 3406-3410, 3412-3416, 3418-3422, 3424-3425,
3427-3428, 3430-3440, 3442-3464, 3466-3483, 3485-3488, 3490-3503, 3505-3512, 3514-3521,
3523-3524, 3526-3536, 3538-3542, 3544-3554, 3556-3572, 3574-3603, 3605-3608, 3610-3611,
3613-3614, 3616-3626, 3628-3644, 3646-3662, 3664-3668, 3670-3680, 3682-3686, 3688-3692,
3694-3698, 3700-3701, 3703-3716, 3718-3734, 3736-3752, 3754-3764, 3766-3770, 3772-3791,
3793-3806, 3808-3812, 3814-3830, 3832-3836, 3838-3842, 3844-3848, 3850-3854, 3856-3866,
3868-3878, 3880-3881, 3883-3887, 3889-3893, 3895-3899, 3901-3905, 3907-3915, 3917,
3919-3923, 3925-3929, 3931-3935, 3937-3941, 3943-3947, 3949-3953, 3955-3959, 3961-3965,
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
5 of 26

### Page 6

3967-3968, 3970-3977, 3979-3983, 3985-3989, 3991-3995, 3997-4001, 4003-4013, 4015-4019,
4021-4025, 4027-4031, 4033-4037, 4039-4043, 4045-4047, 4049-4051, 4053-4054, 4057-4061,
4063-4067, 4069-4073, 4075-4079, 4081-4085, 4087-4090, 4092-4097, 4100-4103, 4105-4109,
4111-4121, 4123-4127, 4129-4133, 4135-4139, 4142-4151, 4153-4163, 4165-4175, 4177-4180,
4183-4187, 4189-4211, 4213-4217, 4220-4223, 4225-4229, 4231-4235, 4237-4241, 4243-4253,
4255, 4257-4259, 4261-4265, 4267-4271, 4273-4277, 4279-4283, 4285-4289, 4291-4293, 4295,
4297-4301, 4303-4307, 4309-4325, 4327-4330, 4332-4337, 4339-4343, 4345-4355, 4357-4365,
4367, 4369-4373, 4375-4379, 4381-4385, 4387-4391, 4393-4398, 4400-4402, 4404-4407,
4409-4413, 4415-4424, 4426-4429, 4431-4435, 4437-4440, 4442-4444, 4447-4451, 4453-4456,
4458-4462, 4464-4467, 4469-4472, 4474-4478, 4480, 4482-4483, 4485-4489, 4491-4494,
4496-4505, 4507-4523, 4525-4530, 4532-4545, 4548, 4550-4566, 4568-4581, 4583-4588,
4590-4591, 4593-4599, 4601-4602, 4604-4608, 4610-4613, 4615-4620, 4622-4624, 4626-4627,
4629-4631, 4633-4635, 4637-4638, 4640-4642, 4644-4645, 4647-4649, 4651-4653, 4655-4656,
4658-4660, 4662-4663, 4665-4667, 4669-4671, 4674, 4676-4678, 4680-4681, 4683-4685,
4687-4689, 4691-4692, 4694-4696, 4698-4699, 4701-4703, 4705-4707, 4709-4710, 4712-4714,
4716-4717, 4719-4721, 4723-4725, 4727, 4729-4732, 4734-4736, 4738-4743, 4745-4746,
4748-4750, 4752-4754, 4756-4757, 4759-4767, 4769-4772, 4774-4779, 4781-4783, 4785-4786,
4788-4790, 4792-4794, 4796-4801, 4803-4808, 4810-4812, 4814-4817, 4819-4821, 4823-4824,
4826-4828, 4830-4831, 4833-4835, 4837-4839, 4841-4842, 4844-4846, 4848-4849, 4851-4858,
4860, 4862-4867, 4869-4875, 4877-4882, 4884-4886, 4888-4893, 4895-4897, 4900, 4902,
4904-4906, 4908-4917, 4919-4924, 4926-4937, 4940-4946, 4948-4949, 4951-4957, 4959-4960,
4962-4964, 4966-4975, 4977, 4979-4986, 4988-4989, 4991-4997, 4999-5011, 5013-5019,
5022-5028, 5030-5035, 5037-5042, 5044-5046, 5048-5057, 5059-5066, 5068-5069, 5071-5073,
5075-5080, 5082-5087, 5089-5091, 5093-5095, 5097, 5099-5106, 5108-5109, 5111-5113,
5115-5117, 5119-5133, 5135-5137, 5139-5142, 5144-5149, 5151-5161, 5163-5167, 5169-5171,
5173-5175, 5177, 5179-5182, 5184-5189, 5191-5209, 5211-5213, 5215-5217, 5219-5222,
5224-5230, 5232-5241, 5243-5245, 5247-5249, 5251-5253, 5255-5257, 5259-5261, 5264-5270,
5272-5281, 5283-5285, 5287-5289, 5291-5292, 5295-5297, 5300-5302, 5304-5310, 5312-5319,
5321-5323, 5325-5327, 5329-5331, 5333-5335, 5337, 5340-5346, 5348-5357, 5359-5361,
5363-5365, 5367, 5369-5370, 5372-5382, 5384-5386, 5388-5390, 5392-5394, 5396-5397, 5399,
5401-5403, 5405-5407, 5409-5411, 5413-5415, 5417-5418, 5420-5422, 5424-5427, 5429-5430,
5432-5445, 5447-5449, 5451-5453, 5455-5457, 5460-5462, 5464-5466, 5468-5470, 5472-5474,
5476-5477, 5479-5481, 5483-5489, 5491-5493, 5495-5497, 5499-5504, 5506-5509, 5511-5519,
5521-5535, 5537-5539, 5541, 5543-5546, 5548-5550, 5552-5558, 5560-5562, 5564-5566,
5568-5569, 5571-5577, 5579-5581, 5583-5586, 5588-5596, 5598-5600, 5603, 5605-5619,
5621-5622, 5624-5638, 5640-5655, 5657-5658, 5660-5662, 5664-5667, 5669-5674, 5676-5679,
5681, 5683-5685, 5687-5693, 5695-5711, 5713-5727, 5729, 5731-5733, 5735-5737, 5739,
5741-5742, 5744-5764, 5766-5767, 5769-5771, 5773-5775, 5777-5782, 5784-5786, 5789-5790,
5792-5795, 5797, 5799-5805, 5807-5813, 5815-5817, 5819-5822, 5824, 5826-5836, 5838-5840,
5842-5848, 5850, 5853-5857, 5859-5872, 5874-5879, 5881, 5883-5889, 5891-5893, 5895-5901,
5904-5920, 5922-5935, 5938-5947, 5949-5962, 5964-5967, 5969-5971, 5973-5975, 5977-5979,
5981-5991, 5994-6001, 6003-6005, 6007-6017, 6019, 6022-6028, 6030-6033, 6035-6036,
6038-6040, 6042-6047, 6049-6053, 6055-6057, 6059-6066, 6068-6073, 6075, 6077-6091,
6093-6099, 6101-6103, 6106-6112, 6115-6131, 6133-6134, 6136-6138, 6140-6142, 6144-6153,
6155-6159, 6161-6163, 6165-6175, 6177-6183, 6185-6187, 6190-6194, 6196-6211, 6213-6215,
6217-6218, 6220-6221, 6223-6224, 6226-6236, 6238-6240, 6242-6243, 6245, 6247-6249,
6251-6255, 6257-6264, 6266-6271, 6274-6289, 6291-6293, 6295-6299, 6302-6304, 6306-6307,
6309-6311, 6313-6325, 6327, 6329-6332, 6334-6343, 6345, 6347-6355, 6357-6359, 6361-6366,
6368-6371, 6373-6374, 6376-6383, 6386-6391, 6393-6395, 6397-6400, 6402-6404, 6406-6407,
6409-6411, 6413-6419, 6421, 6423-6429, 6431-6439, 6442-6447, 6449-6455, 6457-6458,
6460-6463, 6465-6467, 6469, 6471, 6473, 6475-6480, 6482-6489, 6491, 6493-6494, 6496-6498,
6500-6507, 6509-6511, 6513-6514, 6516, 6518-6520, 6522-6527, 6529, 6531, 6533-6534,
6536-6541, 6543-6547, 6549-6554, 6556-6559, 6561, 6563, 6565-6568, 6570-6574, 6576-6581,
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
6 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT

### Page 7

6583, 6585-6588, 6590-6593, 6596-6597, 6599-6602, 6604-6606, 6608, 6610-6611, 6613-6615,
6617-6620, 6622, 6624, 6626-6628, 6631-6633, 6635-6638, 6640-6642, 6644-6647, 6649-6651,
6653, 6655-6656, 6660, 6662-6665, 6667-6669, 6671, 6673-6676, 6678-6680, 6682-6685,
6688-6689, 6691-6694, 6696-6698, 6701-6703, 6705-6707, 6709-6710, 6712, 6714-6716, 6718,
6721, 6723-6725, 6727, 6729-6730, 6732, 6734, 6736-6739, 6741-6743, 6745-6748, 6751-6752,
6754-6757, 6759-6761, 6763-6766, 6768-6770, 6772-6775, 6777-6779, 6781-6782, 6786-6788,
6790, 6793, 6795, 6797, 6799-6802, 6804, 6806, 6808-6809, 6811, 6813, 6815, 6817, 6820,
6822-6824, 6826-6827, 6829, 6831-6833, 6835-6836, 6840, 6842, 6844-6845, 6847, 6849, 6851,
6853-6854, 6856-6858, 6860, 6863, 6865, 6867, 6869-6871, 6873, 6878, 6880, 6882-6883, 6885,
6887-6889, 6892, 6894, 6896, 6898, 6900-6903, 6905, 6907, 6910, 6912, 6914, 6916, 6918-6919,
6921, 6923, 6925, 6927-6928, 6930, 6932-6934, 6936-6937, 6939, 6943, 6945-6946, 6948, 6950,
6952, 6955, 6957-6959, 6962, 6964, 6966-6967, 6969, 6971-6972, 6977, 6979, 6981-6982, 6984,
6986-6987, 6989, 6992, 6994, 6997, 6999, 7001-7002, 7007, 7009, 7011-7012, 7014, 7016-7017,
7019, 7022, 7024, 7026, 7029, 7031-7032, 7034, 7036-7037, 7039, 7041, 7046-7047, 7049, 7052,
7054, 7057, 7059, 7061, 7063, 7066-7067, 7071-7072, 7076, 7081-7082, 7084, 7086-7087, 7089,
7091-7092, 7094, 7097, 7099, 7101-7102, 7106-7107, 7109, 7112, 7116-7117, 7119, 7121-7122,
7124, 7127, 7129, 7131, 7134, 7136-7137, 7139, 7141-7142, 7146, 7149, 7151-7152, 7154, 7157,
7159, 7161-7162, 7164, 7167, 7169, 7172, 7174, 7176-7177, 7179, 7182, 7187, 7189, 7191, 7194,
7197, 7199, 7202, 7204, 7206, 7209, 7212, 7214, 7217, 7224, 7227, 7232, 7234-7235, 7242,
7244, 7247, 7249, 7251, 7257, 7262, 7264, 7269, 7272, 7277, 7280, 7287, 7292, 7294, 7297,
7302, 7304, 7307, 7312, 7314, 7317, 7322, 7327, 7332, 7334, 7337, 7339, 7342, 7347, 7349,
7352, 7357, 7362, 7367, 7369, 7372, 7377, 7382, 7387, 7417, 7432, 7447, 7457, 7467, 7472,
7477, 7482, 7502, 7512, 7522, 7527, 7547, 7557, 7577, 7582, 7587, 7597, 8592, 9103-99999 in
1 Group(s). Where the effectivity is presented with hyphens between line numbers, the airplane
applicability means "through" and "inclusive", e.g. line numbers 1-9 means line numbers 1 through
9 inclusive.
The Variable Numbers and Group Information for the applicable airplanes is given below. An
equivalent change is on subsequent production airplanes.
NOTE: The Variable Number table below includes all affected airplanes up to Line Number 9103.
Affected airplanes after Line Number 9103 will be added to the service bulletin's
MyBoeingFleet.com (MBF) "get effectivity" result when they are added to the MBF Fleet
Profile Page.
DESCRIPTIONCONFIGURATIONGROUP
737-600/-700/-700C/-800/-900 Airplanes, line numbers 1756 and
subsequent with 0.040 inch thick web.
-1
Airplane Models:
737-600, 737-700, 737-700C, 737-800, 737-900
GroupVariable Number
1YA977 - YA978
1YB158
1YB382 - YB392
GroupVariable Number
1YB575
1YB578 - YB580
1YB588 - YB598
GroupVariable Number
1YB633 - YB636
1YB671 - YB672
1YB874
Export Controlled ECCN: 9E991
Copyright © Unpublished
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Original Issue: August 26, 2021
737-53A1403 RB
7 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT

### Page 8

GroupVariable Number
1YB889 - YB893
1YB961 - YB975
1YB981
1YB986 - YB998
1YC084
1YC095
1YC179
1YC190
1YC387
1YC438 - YC439
1YC742 - YC750
1YD109 - YD117
1YD413 - YD424
1YD492 - YD499
1YD654 - YD655
1YE371 - YE383
1YF001 - YF011
1YF021 - YF049
1YF051 - YF080
1YF086 - YF087
1YF106 - YF107
1YF111 - YF114
1YF116 - YF119
1YF121 - YF132
1YF176 - YF178
1YF191 - YF192
1YF201 - YF276
1YF401 - YF402
1YF431 - YF432
1YF436 - YF437
1YF441 - YF442
1YF451 - YF460
1YF501 - YF599
GroupVariable Number
1YF601 - YF685
1YF691 - YF695
1YF701 - YF707
1YF801 - YF805
1YF831 - YF832
1YF836 - YF838
1YF871 - YF872
1YF901 - YF905
1YF921 - YF928
1YF951 - YF954
1YG092 - YG099
1YG101 - YG104
1YG111 - YG114
1YG116 - YG149
1YG202 - YG205
1YG212 - YG214
1YG221 - YG224
1YG251 - YG252
1YG509 - YG517
1YG701
1YG711
1YG721 - YG722
1YJ005 - YJ010
1YJ547 - YJ579
1YJ595 - YJ599
1YJ683 - YJ694
1YJ854 - YJ860
1YJ872 - YJ880
1YJ903 - YJ904
1YJ908 - YJ910
1YJ924 - YJ929
1YJ937
1YJ944 - YJ956
GroupVariable Number
1YJ961
1YJ976 - YJ977
1YK133
1YK138 - YK139
1YK141 - YK142
1YK146 - YK148
1YK151 - YK154
1YK161 - YK167
1YK171
1YK176 - YK177
1YK186
1YK191
1YK196
1YK201 - YK202
1YK305 - YK314
1YK331 - YK340
1YK367 - YK378
1YK433 - YK450
1YK461 - YK467
1YK471 - YK473
1YK476
1YK478
1YK485 - YK487
1YK491 - YK493
1YK495 - YK499
1YK513 - YK516
1YK521 - YK530
1YK551 - YK571
1YK576 - YK577
1YK580 - YK585
1YK602
1YK606 - YK607
1YK611 - YK616
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GroupVariable Number
1YK621 - YK634
1YK641 - YK644
1YK651 - YK665
1YK671 - YK672
1YK676 - YK677
1YK681 - YK686
1YK691
1YK695 - YK699
1YK701 - YK713
1YK716 - YK719
1YK721 - YK741
1YK751 - YK770
1YK776 - YK778
1YK781 - YK785
1YK791 - YK792
1YK796 - YK797
1YK801 - YK899
1YK901 - YK912
1YK918 - YK919
1YK921 - YK929
1YK941 - YK999
1YL001 - YL005
1YL011 - YL016
1YL021 - YL024
1YL051 - YL052
1YL056 - YL057
1YL061
1YL066 - YL069
1YL076 - YL077
1YL101 - YL137
1YL241 - YL242
1YL271 - YL272
1YL281 - YL284
GroupVariable Number
1YL301 - YL303
1YL311 - YL314
1YL316 - YL321
1YL351 - YL353
1YL371 - YL374
1YL401
1YL421 - YL429
1YL431 - YL444
1YL461 - YL478
1YL531 - YL534
1YL541 - YL551
1YL561 - YL579
1YL591 - YL598
1YL601 - YL606
1YL611 - YL612
1YL616 - YL617
1YL621
1YL626
1YL631 - YL634
1YL636 - YL637
1YL661 - YL664
1YL676 - YL691
1YL701 - YL707
1YL731
1YL751 - YL752
1YL756 - YL757
1YL780
1YL796 - YL797
1YL801 - YL815
1YL901 - YL910
1YL921 - YL940
1YL951 - YL968
1YM205 - YM244
GroupVariable Number
1YM268 - YM299
1YM301 - YM399
1YM401 - YM415
1YM483 - YM484
1YM501 - YM515
1YM522
1YM552 - YM553
1YM571 - YM572
1YM581 - YM582
1YM591 - YM599
1YM631 - YM634
1YM641 - YM652
1YM671 - YM674
1YM691 - YM699
1YM701 - YM710
1YM761 - YM765
1YM771 - YM779
1YN001 - YN016
1YN021 - YN024
1YN061
1YN071 - YN082
1YN091 - YN092
1YN101 - YN112
1YN121
1YN126
1YN201 - YN202
1YN211 - YN219
1YN231 - YN236
1YN261
1YN501
1YN531 - YN534
1YN551 - YN566
1YN581 - YN585
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GroupVariable Number
1YN591 - YN593
1YN601 - YN606
1YN651 - YN653
1YN661 - YN663
1YN666 - YN667
1YN671 - YN674
1YN701 - YN702
1YN741 - YN746
1YN756 - YN758
1YQ001 - YQ003
1YQ011 - YQ021
1YQ026 - YQ029
1YQ036 - YQ045
1YQ201 - YQ207
1YQ231
1YQ241 - YQ251
1YQ281 - YQ284
1YQ291 - YQ296
1YQ301 - YQ302
1YQ331 - YQ334
1YQ346 - YQ347
1YQ351 - YQ367
1YQ371
1YQ401 - YQ403
1YQ451 - YQ454
1YQ456
1YQ461
1YQ471
1YQ501 - YQ520
1YQ601 - YQ606
1YQ610 - YQ614
1YR001 - YR098
1YR101 - YR105
GroupVariable Number
1YR111 - YR124
1YR126 - YR144
1YR166 - YR182
1YR186 - YR198
1YR201 - YR215
1YR231 - YR294
1YR296 - YR297
1YR301 - YR334
1YR338 - YR341
1YR361 - YR366
1YR371 - YR373
1YR376 - YR377
1YR381 - YR382
1YR391
1YR396 - YR399
1YR401 - YR405
1YR411 - YR413
1YR416 - YR418
1YR421 - YR424
1YR426 - YR440
1YR446 - YR455
1YR457 - YR499
1YR501 - YR506
1YR511 - YR520
1YR526 - YR544
1YR546 - YR551
1YR556 - YR562
1YR571 - YR582
1YR591 - YR592
1YR601 - YR605
1YR616 - YR658
1YR661 - YR663
1YR671 - YR673
GroupVariable Number
1YR676 - YR678
1YR681 - YR682
1YR701 - YR769
1YR771 - YR799
1YR801 - YR827
1YR831 - YR838
1YR841 - YR899
1YR901 - YR903
1YR931 - YR934
1YR938 - YR944
1YR951 - YR998
1YS001 - YS002
1YS006 - YS009
1YS031 - YS032
1YS051 - YS073
1YS101 - YS120
1YS126 - YS142
1YS146 - YS160
1YS166 - YS194
1YS196 - YS197
1YS201 - YS209
1YS221 - YS225
1YS231 - YS236
1YS271 - YS288
1YS295 - YS296
1YS301 - YS348
1YS351 - YS378
1YS381 - YS386
1YS393 - YS395
1YS401
1YS451
1YS456 - YS457
1YS462 - YS465
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GroupVariable Number
1YS467
1YS501 - YS502
1YS506
1YS511 - YS518
1YS531
1YS536 - YS538
1YS541 - YS542
1YS546
1YS551 - YS556
1YS561 - YS578
1YS581 - YS595
1YS601 - YS690
1YS701 - YS716
1YS721 - YS762
1YS771 - YS780
1YS806 - YS810
1YS816 - YS818
1YS823 - YS825
1YS851 - YS863
1YS876
1YS881 - YS884
1YS891 - YS894
1YS896 - YS897
1YS901 - YS909
1YS911 - YS957
1YS961 - YS974
1YS976 - YS977
1YS981 - YS987
1YS991 - YS998
1YT026 - YT027
1YT031 - YT032
1YT036 - YT038
1YT061 - YT068
GroupVariable Number
1YT101 - YT138
1YT176 - YT185
1YT191
1YT196 - YT199
1YT201
1YT206 - YT207
1YT211 - YT213
1YT251 - YT299
1YT301 - YT307
1YT311 - YT312
1YT321 - YT355
1YT371 - YT372
1YT381
1YT391 - YT396
1YT401 - YT403
1YT411 - YT417
1YT427
1YT461 - YT477
1YT491 - YT492
1YT501 - YT521
1YT551 - YT552
1YT556 - YT563
1YT565
1YT571 - YT578
1YT601 - YT606
1YT701 - YT708
1YT723 - YT726
1YT761 - YT781
1YT791 - YT794
1YT796 - YT797
1YT801 - YT804
1YT811 - YT813
1YT826 - YT827
GroupVariable Number
1YT831 - YT832
1YT841 - YT852
1YT856 - YT863
1YT885 - YT887
1YT891 - YT895
1YT901 - YT998
1YV001 - YV012
1YV021 - YV023
1YV030 - YV034
1YV037 - YV042
1YV045 - YV047
1YV051 - YV059
1YV081
1YV083 - YV084
1YV097 - YV099
1YV101 - YV154
1YV201 - YV203
1YV251 - YV252
1YV256 - YV257
1YV301 - YV312
1YV351 - YV368
1YV381 - YV388
1YV391 - YV394
1YV401
1YV411 - YV413
1YV431 - YV433
1YV441 - YV454
1YV461 - YV464
1YV467 - YV470
1YV501 - YV512
1YV521
1YV571 - YV586
1YV596
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GroupVariable Number
1YV601 - YV605
1YV651 - YV674
1YV676
1YV695 - YV696
1YV701 - YV702
1YV711
1YV722 - YV731
1YV741 - YV794
1YV801 - YV820
1YV831 - YV848
1YV881 - YV883
1YV901 - YV915
1YV923 - YV926
1YV971 - YV983
1YW001
1YW011 - YW099
1YW101 - YW164
1YW201 - YW212
1YW226 - YW240
GroupVariable Number
1YW245 - YW261
1YW263
1YW267 - YW281
1YW283 - YW285
1YW292 - YW299
1YW351
1YW356 - YW358
1YW361 - YW366
1YW371 - YW399
1YW401 - YW430
1YW441 - YW445
1YW451 - YW452
1YW471 - YW472
1YW491 - YW498
1YW531 - YW536
1YW541 - YW545
1YW551 - YW580
1YW585 - YW591
1YW595 - YW596
GroupVariable Number
1YW601
1YW610 - YW613
1YW616 - YW623
1YW666
1YW696 - YW699
1YW701 - YW715
1YW726 - YW731
1YW766 - YW775
1YW801 - YW803
1YW811 - YW813
1YW821
1YW831
1YW881
1YW891 - YW893
1YW906 - YW910
1YW916 - YW918
1YW921 - YW925
1YW971 - YW976
--
B. Spares Affected
None.
2. CONCURRENT REQUIREMENTS
None.
3. COMPLIANCE
Federal Aviation Administration (FAA) Airworthiness Directive AD 2013-19-23 is related to this Requirements
Bulletin 737-53A1403 RB. The effective date of AD AD 2013-19-23 is November 7, 2013.
The Federal Aviation Administration (FAA) will possibly release an additional Airworthiness Directive related
to this Requirements Bulletin 737-53A1403 RB. The Airworthiness Directive will make the compliance tasks
and times given in this Requirements Bulletin 737-53A1403 RB mandatory.
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### Page 13

For airplanes which have incorporated Boeing Business Jet (BBJ) Lower Cabin Altitude Supplemental Type
Certificate (STC) ST01697SE (6500 feet maximum cabin altitude in lieu of 8000 feet) as referenced in
Boeing SB 737-21-1149, the flight cycle related compliance times are different from those specified in this
Requirements Bulletin. All initial compliance times (thresholds) specified in flight cycles must be reduced
to half of those specified in this Requirements Bulletin. All repeat interval compliance times specified in
flight cycles must be reduced to one-quarter of those specified in this Requirements Bulletin.
Accomplish the required action(s), based on the applicable condition(s) in Table(s) 1, in accordance with
Accomplishment Instructions.
When more than one OPTION is given for a CONDITION, do only one of the OPTION numbers. When
more than one ACTION is given for a CONDITION or an OPTION, do all of the ACTION numbers for that
CONDITION or OPTION.
Table 1: STA 1016 Aft Pressure Bulkhead - Apex Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Within 4,000
flight cycles after
the original issue
date of the Re-
quirements Bul-
letin 737-
53A1403 RB.
Before 23,000
total flight cy-
cles.
Do a General Visual inspec-
tion of the Aft Pressure Bulk-
head (APB) aft side for any
repair.
All Airplanes
-Within 4,000
flight cycles after
the original issue
date of the Re-
quirements Bul-
letin 737-
53A1403 RB.
Before 23,000
total flight cy-
cles.
CONDITION 1 (ACTION 1):
Contact The Boeing Company
for alternative inspection(s) to
Requirements Bulletin 737-
53A1403 RB, and do the alter-
native inspection(s) and appli-
cable on-condition action(s).
(a)
CONDITION 1:
ANY REPAIR FOUND.
-Within 4,000
flight cycles after
the original issue
date of the Re-
quirements Bul-
letin 737-
53A1403 RB.
Before 23,000
total flight cy-
cles.
CONDITION 1 (ACTION 2):
Do a Detailed, High Frequency
Eddy Current (HFEC) and Low
Frequency Eddy Current
(LFEC) inspections of the APB
aft side for any crack at the
unrepaired areas.
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### Page 14

Table 1: STA 1016 Aft Pressure Bulkhead - Apex Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
-Before further flight.CONDITION 1.1 (ACTION 1):CONDITION 1.1:
Contact The Boeing Company
for repair instructions and do
the repair.
ANY CRACK FOUND.
4,000 flight cycles.-CONDITION 1.1 (ACTION 2):
Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack at
the unrepaired areas. (b)
4,000 flight cycles.-Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack at
the unrepaired areas. (b)
CONDITION 1.2:
NO CRACK FOUND.
-Within 4,000
flight cycles after
the original issue
date of the Re-
quirements Bul-
letin 737-
53A1403 RB.
Before 23,000
total flight cy-
cles.
Do a Detailed, HFEC and
LFEC inspections of the APB
aft side for any crack.
CONDITION 2:
NO REPAIR FOUND.
-Before further flight.CONDITION 2.1 (ACTION 1):CONDITION 2.1:
Contact The Boeing Company
for repair instructions and do
the repair.
ANY CRACK FOUND.
4,000 flight cycles.-CONDITION 2.1 (ACTION 2):
Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack. (b)
4,000 flight cycles.-Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack. (b)
CONDITION 2.2:
NO CRACK FOUND.
(a) CONDITION 1 (ACTION 1) is not required for any repair found during the General Visual Inspection of
the APB aft side in areas where a repair covers the affected inspection zones provided that the installed
repair was approved by The Boeing Company Organization Designation Authorization (ODA) via a FAA
Form 8100-9 and inspections are accomplished in accordance with the scheduled repair approval listed
on the FAA Form 8100-9.
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### Page 15

Table 1: STA 1016 Aft Pressure Bulkhead - Apex Inspection
Repeat Interval
(Not to Exceed)
Boeing Recommended
Compliance Time (Whichever
Occurs Later)
ActionCondition
(b) It is not required to do the inspections of the APB aft side in areas where a repair covers the affected in-
spection zones provided:
1. The repair is the corrective action to the crack condition identified in Requirements Bulletin 737-
53A1403 RB installed after the original issue date of Requirements Bulletin 737-53A1403 RB
AND
2. The installed repair was approved by The Boeing Company Organization Designation Authorization
(ODA) via a FAA Form 8100-9.
4. APPROVAL
This Requirements Bulletin was examined by the Federal Aviation Administration (FAA). The changes
specified in this document comply with the applicable regulations and are FAA approved, as well as European
Union Aviation Safety Agency (EASA)/Joint Aviation Authorities (JAA) approved for all EASA/JAA approved
airplanes listed in this Requirements Bulletin effectivity. This document and its approval were based on the
airplane in its original Boeing delivery configuration or as modified by other Boeing changes.
This Requirements Bulletin is also approved for airplanes having FAA Aviation Partners Boeing (APB)
Supplemental Type Certificate (STC) number ST00830SE installed (not including any areas affected by
the split scimitar winglet configuration).
For 737-700C and BBJ models that have APB winglets installed by STC number ST00830SE, the operator
is responsible for obtaining appropriate regulatory agency approval before incorporating this Requirements
Bulletin if the bulletin is in the area affected by blended winglets.
This Requirements Bulletin is also approved for airplanes converted into 737-800BCF under project number
TS14-0042 that have incorporated Boeing drawing 800A0003 specified in Type Certificate Data Sheet
(TCDS).
If an airplane has a non-Boeing modification or repair that affects a component or system also affected by
this Requirements Bulletin, the operator is responsible for obtaining appropriate regulatory agency approval
before incorporating this Requirements Bulletin.
In addition, the Manager of the FAA Seattle ACO Branch approves the incorporation of the inspection
program defined in Figure 2, at the times specified in Paragraph 3. Compliance, of this Requirements
Bulletin, as an AMOC to the incorporation of the inspections for PSEs 53-80-01-3 and 53-80- 01-7, as
required by paragraphs (g) and (h) of AD 2013-19-23, in the Figure 2 inspection area only. All provisions
of AD 2013-19-23 that are not specifically reference above remain fully applicable and must be complied
with accordingly.
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### Page 16

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BLANK PAGE

### Page 17

5.    ACCOMPLISHMENT INSTRUCTIONS
A. GENERAL INFORMATION
NOTE: 1. This is an Enhanced Required for Compliance document. There will be a separate
Service Bulletin (SB) and a separate Requirements Bulletin (RB). If an RB is mandated
by an Airworthiness Directive (AD), then all applicable requirements specified in the
RB must be done. For the related SB, some locations are marked RC Start and RC
End to identify the requirements that are restated from the RB. For the related SB,
the areas between RC Start and RC End, including sub-steps and any figures
identified between RC Start and RC End, must be done to comply with the AD.
Therefore, an Alternative Method of Compliance (AMOC) is required for any deviations
to steps between RC Start and RC End, including substeps and identified figures.
For the related SB, the steps not between RC Start and RC End may be deviated
from using accepted methods in accordance with the operator's maintenance or
inspection program without obtaining approval of an AMOC; this is provided that the
steps between RC Start and RC End, including sub-steps and identified figures, can
still be done as specified, and the airplane can be put back in an airworthy condition.
Figures not required for compliance are omitted from the RB.
2. This is an Enhanced Required for Compliance document. The Boeing processes
used to create the Service Bulletin (SB) and the Requirements Bulletin (RB) ensure
that the information between "RC Start" and "RC End" in the SB are identical to the
information in the same sections (Compliance, Work Instructions...) of the RB which
the SB refers to as the related document.
3. The compliance times for the actions in WORK INSTRUCTIONS are in Compliance.
4. Boeing Service Letter 737-SL-51-042, Damage Reporting and Repair Plan/Design
Guidelines, is an acceptable procedure to request information from Boeing for
additional structural repair instructions. The Service Letter describes what information
must be provided to Boeing before a structural repair can be provided.
5. Unless shown differently, these dimensions and tolerances are used:
– Linear dimensions are in inches
– Tolerance on linear dimensions, other than rivet and bolt edge margins, is plus
or minus 0.03 inch
– Tolerance on rivet and bolt edge margin is plus or minus 0.05 inch
– Angular tolerance is plus or minus 2 degrees
– Hole dimensions for standard solid rivets and fasteners are in Structural Repair
Manual (SRM) Chapter 51
– Torque Values:
— Values for structural fasteners are given in 737 Structural Repair Manual,
Chapter 51.
— Values for airframe maintenance tasks are included in Chapter 20 of 737
Aircraft Maintenance Manual (AMM).
— Values for electrical maintenance tasks are included in Chapter 20 of
Standard Wiring Practices Manual (SWPM).
— Values for engine maintenance tasks are included in Chapter 70 of 737
Aircraft Maintenance Manual (AMM).
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### Page 18

— Non-standard torque values for maintenance tasks are included in the
applicable installation step.
6. These work instructions refer to procedures included in other Boeing documents.
When the words "refer to" are used and the operator has an accepted alternative
procedure, the accepted alternative procedure can be used. When the words "in
accordance with" are included in the instruction, the procedure in the Boeing document
must be used.
7. If it is necessary to remove more parts for access, you can remove those parts. If
you can get access without removing identified parts, it is not necessary to remove
all of the identified parts. Jacking and shoring limitations must be observed.
8. A Detailed Inspection is defined as: An intensive examination of a specific item,
installation or assembly to detect damage, failure or irregularity. This could include
tactile assessment in which a component or assembly can be checked for
tightness/security. Available lighting is normally supplemented with a direct source
of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors
and magnifying lenses may be necessary. Surface cleaning and elaborate access
procedures may be required.
9. A General Visual Inspection is defined as: A visual examination of an interior or
exterior area, installation or assembly to detect obvious damage, failure or irregularity.
This level of inspection is made from within touching distance, unless otherwise
specified. A mirror may be necessary to enhance visual access to all exposed surfaces
in the inspection area. This level of inspection is made under normally available
lighting conditions such as daylight, hangar lighting, flashlight or drop-light and may
require removal or opening of access panels or doors. Stands, ladders or platforms
may be required to gain proximity to the area being checked. Basic cleaning may be
required to ensure appropriate visibility.
10. When more than one OPTION is given for a CONDITION, do only one of the OPTION
numbers. When more than one ACTION is given for a CONDITION or an OPTION,
do all of the ACTION numbers for that CONDITION or OPTION.
B. WORK INSTRUCTIONS
Actions Required For Compliance
1. Requirements
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### Page 19

Table 1: STA 1016 Aft Pressure Bulkhead - Apex Inspection
Refer to the listed proce-
dures in SB 737-53A1403
Original Issue or later
approved revisions as an
accepted procedure.
Method of ComplianceActionCondition
PART 1: OPEN ACCESS-Do a General Visual inspec-
tion of the Aft Pressure Bulk-
head (APB) aft side for any
repair.
All Airplanes
-FIGURE 1
--CONDITION 1 (ACTION 1):CONDITION 1:
Contact The Boeing Company
for alternative inspection(s) to
Requirements Bulletin 737-
53A1403 RB, and do the alter-
native inspection(s) and appli-
cable on-condition action(s).
(a)
ANY REPAIR FOUND.
-FIGURE 2CONDITION 1 (ACTION 2):
Do a Detailed, High Frequency
Eddy Current (HFEC) and Low
Frequency Eddy Current
(LFEC) inspections of the APB
aft side for any crack at the
unrepaired areas.
PART 2: CLOSE ACCESS-CONDITION 1.1 (ACTION 1):CONDITION 1.1:
Contact The Boeing Company
for repair instructions and do
the repair.
ANY CRACK FOUND.
PART 1: OPEN ACCESS-CONDITION 1.1 (ACTION 2):
Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack at
the unrepaired areas. (b)
-FIGURE 2
PART 2: CLOSE ACCESS--CONDITION 1.2:
NO CRACK FOUND. PART 1: OPEN ACCESS-Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack at
the unrepaired areas. (b)
-FIGURE 2
-FIGURE 2Do a Detailed, HFEC and
LFEC inspections of the APB
aft side for any crack.
CONDITION 2:
NO REPAIR FOUND.
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### Page 20

Table 1: STA 1016 Aft Pressure Bulkhead - Apex Inspection
Refer to the listed proce-
dures in SB 737-53A1403
Original Issue or later
approved revisions as an
accepted procedure.
Method of ComplianceActionCondition
PART 2: CLOSE ACCESS-CONDITION 2.1 (ACTION 1):CONDITION 2.1:
Contact The Boeing Company
for repair instructions and do
the repair.
ANY CRACK FOUND.
PART 1: OPEN ACCESS-CONDITION 2.1 (ACTION 2):
Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack. (b)
-FIGURE 2
PART 2: CLOSE ACCESS--CONDITION 2.2:
NO CRACK FOUND. PART 1: OPEN ACCESS-Repeat the Detailed, HFEC
and LFEC inspections of the
APB aft side for any crack. (b) -FIGURE 2
(a) CONDITION 1 (ACTION 1) is not required for any repair found during the General Visual Inspection of
the APB aft side in areas where a repair covers the affected inspection zones provided that the installed
repair was approved by The Boeing Company Organization Designation Authorization (ODA) via a FAA
Form 8100-9 and inspections are accomplished in accordance with the scheduled repair approval listed
on the FAA Form 8100-9.
(b) It is not required to do the inspections of the APB aft side in areas where a repair covers the affected in-
spection zones provided:
1. The repair is the corrective action to the crack condition identified in Requirements Bulletin 737-
53A1403 RB installed after the original issue date of Requirements Bulletin 737-53A1403 RB
AND
2. The installed repair was approved by The Boeing Company Organization Designation Authoriza-
tion (ODA) via a FAA Form 8100-9.
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
20 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT

### Page 21 (OCR)

REQUIREMENTS BULLETIN 737-53A1403
ALERT  ALERT
BL
S-7L
ACCESS
DOOR
WEB LAP SPLICE
(7 LOCATIONS)
→ S-7R
S-15L-
S-23L  -S-15R
S-23R
AFT PRESSURE BULKHEAD
FIGURE 1: AFT PRESSURE BULKHEAD (APB) - GENERAL VISUAL INSPECTION
(SHEET 1 OF 3)
Original Issue: August 26, 2021
Export Controlled ECCN: 9E991  737-53A1403 RB
Copyright © Unpublished
Work - See page 1 for details.  21 of 26

### Page 22 (OCR)

REQUIREMENTS BULLETIN 737-53A1403
ALERT  ALERT
BLO
S-7L  _S-7R
S-15L  S-15R
! O
S-23L  S-23R
AFT PRESSURE BULKHEAD
INSPECTION AREA  (VIEW LOOKING FORWARD)
2964557
FIGURE 1: AFT PRESSURE BULKHEAD (APB) - GENERAL VISUAL INSPECTION
(SHEET 2 OF 3)
Original Issue: August 26, 2021
Export Controlled ECCN: 9E991  737-53A1403 RB
Copyright © Unpublished
Work - See page 1 for details.  22 of 26

### Page 23

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
More DataQtyIdentificationNameTaskStep
(a)--AFT PRESSURE
BULKHEAD
Inspect1
(a) Do a General Visual Inspection of the aft side of STA 1016 Aft Pressure Bulkhead (APB) for any repair.
FIGURE 1: AFT PRESSURE BULKHEAD (APB) - GENERAL VISUAL INSPECTION
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
23 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT

### Page 24 (OCR)

REQUIREMENTS BULLETIN 737-53A1403
ALERT  ALERT
BL
S-7L
ACCESS
DOOR
WEB LAP SPLICE
(7 LOCATIONS)
S-7R
S-15L -
S-23L  - S-15R
AFT PRESSURE BULKHEAD S-23R
2964560
FIGURE 2: AFT PRESSURE BULKHEAD (APB) - WEB LAP SPLICE INSPECTION AREAS
(SHEET 1 OF 3)
Original Issue: August 26, 2021
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.  9Z102Z

### Page 25 (OCR)

REQUIREMENTS BULLETIN 737-53A1403
ALERT  ALERT
BLO
S-7L  ,S-7R
S-15L  S-15R
S-23L  S-23R
GORE WEB LAP SPLICES FASTENEF
+ INSPECTION LOCATIONS  AFT PRESSURE BULKHEAD
REFERENCE STEP 2 & 3  (VIEW LOOKING FORWARD)
• FASTENER INSPECTION LOCATIONS  OUTSIDE GORE WEB LAP SPLICES  • DETAILED INSPECTION  2964561
REFERENCE STEP 3
FIGURE 2: AFT PRESSURE BULKHEAD (APB) - WEB LAP SPLICE INSPECTION AREAS
(SHEET 2 OF 3)
Original Issue: August 26, 2021
Export Controlled ECCN: 9E991  Copyright © Unpublished  737-53A1403 RB
Work - See page 1 for details.  25 of 26

### Page 26

The step numbers shown below agree with the numbers shown in the circle symbols in the figure. The QTY
numbers shown below are the number of parts necessary for this figure.
More DataQtyIdentificationNameTaskStep
(a)--AFT PRESSURE
BULKHEAD WEBS
Inspect1
(b)--AFT PRESSURE
BULKHEAD WEBS
Inspect2
(c)--AFT PRESSURE
BULKHEAD WEBS
Inspect3
(a) Do a Detailed inspection on the aft side of the STA 1016 Aft Pressure Bulkhead (APB) center dome apex
gore webs including the web edges, lap splices and outside lap splices for any crack.
(b) Do a Low Frequency Eddy Current (LFEC) inspection on the aft side of the STA 1016 APB for any crack
around all hidden web lap splice fasteners in accordance with 737 NDT Manual Part 6, 53-10-64.
(c) Do a High Frequency Eddy Current (HFEC) inspection on the aft side of the STA 1016 APB for any crack
around the web fasteners in accordance with 737 NDT Manual Part 6, 53-10-64.
FIGURE 2: AFT PRESSURE BULKHEAD (APB) - WEB LAP SPLICE INSPECTION AREAS
(SHEET 3 OF 3)
Export Controlled ECCN: 9E991
Copyright © Unpublished
Work - See page 1 for details.
Original Issue: August 26, 2021
737-53A1403 RB
26 of 26
REQUIREMENTS BULLETIN 737-53A1403
ALERTALERT

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