# AD 50-06-02: Wing Spar Inspection - Type: Airworthiness directive - Status: Current - Products: Boeing Airplane Company, Wichita Division 75 (Army PT-13), A75 (Army PT-13A, -13B, -13C), A75J1 (Army PT-18), A75L3, A75L300, A75N1 (Army PT-17, -17A, Navy N2S-1, -4), B75 (Navy N2S-5), B75N1 (Navy N2S-3), D75N1 (Army PT-27), E75 (Army PT-13D, Navy N2S-5, PT-13D/N2S-5), E75N1 (Army PT-13D, Navy N2S-5, PT-13D/N2S-5) and IB75A - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Registered aircraft: 1,654 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B70B12AE23721FD986256A34005BB94B.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/50-06-02 ## The airworthiness directive 50-06-02 BOEING: Applies to All Model 75 Series Aircraft. Compliance required at each annual inspection. For military aircraft, compliance also required prior to original certification. Remove the center section gas tank and inspect both front and rear spars for cracks, checks and warping. Defective spars should be replaced or repaired in accordance with CAM 18. Ascertain that all drain holes are open. Repeated removal of the tank at each annual inspection is not necessary, if after accomplishment of the items mentioned above, the gap between the gas tank and the upper surface of the center section is sealed by doping on grade A fabric tape, or equivalent sealing means, to prevent moisture entering the tank compartment. This supersedes AD 45-51-01. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A-743](https://openairdocs.org/tcds/A-743): The Boeing Company; names 12 of 12 models: B75N1 (Navy N2S-3), 75 (Army PT-13), A75J1 (Army PT-18), E75 (Army PT-13D; Navy N2S-5; PT-13D/N2S-5), A75L3, E75N1 (Army PT-13D; Navy N2S-5; PT-13D/N2S-5), A75L300, A75 (Army PT-13A; -13B; -13C)… ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 1,654 (1,654 by airframe model, 0 by engine model) - Makers: Boeing 1,642, Boeing Stearman/Huff 1, Boeing/Cains Richard G 1, Boeing/Dekker 1, Boeing/Hawk 1, Boeing/Humm Stanley 1, Boeing/Johnson 1, Boeing/Mays 1, Boeing/Mehrer 1, Boeing/Mountain View Air Rep 1 Models with the most aircraft: - [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17): 759 aircraft (airframe model) - [Boeing E75](https://openairdocs.org/model/boeing-e75): 261 aircraft (airframe model) - [Boeing B75N1](https://openairdocs.org/model/boeing-b75n1): 241 aircraft (airframe model) - [Boeing A75](https://openairdocs.org/model/boeing-a75): 93 aircraft (airframe model) - [Boeing E75N1](https://openairdocs.org/model/boeing-e75n1): 79 aircraft (airframe model) - [Boeing A75N1](https://openairdocs.org/model/boeing-a75n1): 59 aircraft (airframe model) - [Boeing D75N1](https://openairdocs.org/model/boeing-d75n1): 35 aircraft (airframe model) - [Boeing A75L300](https://openairdocs.org/model/boeing-a75l300): 33 aircraft (airframe model) - [Boeing A75L3](https://openairdocs.org/model/boeing-a75l3): 32 aircraft (airframe model) - [Boeing 75](https://openairdocs.org/model/boeing-75): 18 aircraft (airframe model) - [Boeing B75](https://openairdocs.org/model/boeing-b75): 15 aircraft (airframe model) - [Boeing IB75A](https://openairdocs.org/model/boeing-ib75a): 12 aircraft (airframe model) - [Boeing E75(N2S-5)](https://openairdocs.org/model/boeing-e75-n2s-5): 2 aircraft (airframe model) - [Boeing A75J1](https://openairdocs.org/model/boeing-a75j1): 2 aircraft (airframe model) - [Boeing/Smith A75N1](https://openairdocs.org/model/boeing-smith-a75n1): 1 aircraft (airframe model) - [Boeing/Dekker A75N1](https://openairdocs.org/model/boeing-dekker-a75n1): 1 aircraft (airframe model) - [Boeing Stearman/Huff A75-N1](https://openairdocs.org/model/boeing-stearman-huff-a75-n1): 1 aircraft (airframe model) - [Boeing/Mays A75N1](https://openairdocs.org/model/boeing-mays-a75n1): 1 aircraft (airframe model) - [Boeing/Hawk E-75](https://openairdocs.org/model/boeing-hawk-e-75): 1 aircraft (airframe model) - [Boeing/Porter/Epperson B-75N1](https://openairdocs.org/model/boeing-porter-epperson-b-75n1): 1 aircraft (airframe model) All 27 models: https://openairdocs.org/ad/50-06-02/models.md Every aircraft: https://openairdocs.org/ad/50-06-02/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ATL97FA095](https://openairdocs.org/ntsb/ATL97FA095), Jul 2, 1997: Boeing Stearman B75N1 (N450GC), Locust Grove, GA, destroyed, 1 fatal. Probable cause: The inadvertent stall encountered by the pilot after experiencing an in-flight cylinder head separation. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.