# AD 72-03-07: Landing Gear Failure - Type: Airworthiness directive - Status: Current - Products: Cessna 310, 310A, 310B, 310C, 310D, 310E, 310F, 310G, 310H, 310I, 310J, 310J-1 and 21 more - Effective: February 9, 1972 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-1391 - Registered aircraft: 3,716 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C42343D7BE48149486256A3400632C9A.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/72-03-07 ## The airworthiness directive 72-03-07 CESSNA: Amdt. 39-1391. Applies to Models 310 (Serial Numbers 310Q0074 through 310Q0425, except 310Q0261, 0271, 0279, 0402, 0409, 0411, 0416, 0420, 0424); Models 340 (Serial Numbers 340-0001 through 340-0009, except 340-0005); Models 401 (Serial Numbers 401B0029 through 401B0204); Models 402 (Serial Numbers 402B0007 through 402B0201); Models 414 (Serial Numbers 414-0052 through 414-0173, except 414-0152, 0153, 0168, 0172); and Models 421 (Serial Numbers 421B0001 through 421B0209, except 421B0144, 0201, 0205, 0208); and all other 300 and 400 series airplanes which may have the original barrel assemblies replaced with new or used assemblies shipped by the manufacturer between January 1, 1970, and December 15, 1971. Compliance: Required as indicated, unless already accomplished. To prevent landing gear failure accomplish the following in accordance with Cessna Service Letter ME71-28 dated December 24, 1971, and Supplement No. 1 dated January 28, 1972, or any equivalent methods approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region: A) Within the next 5 hours' time in service after the effective date of this AD, visually inspect barrel assemblies of the main landing gear upper struts for hydraulic leaks and surface cracks. If such discrepancies are noted, prior to further flight, replace the appropriate barrel assemblies. B) To accomplish the inspection required by Paragraph A the airplane may be flown in accordance with FAR 21.197 to a base where the inspection may be performed. C) Within the next 25 hours' time in service after the effective date of this AD, conduct chemical tests to determine if barrel assemblies of the main landing gear upper struts are composed of dissimilar or incorrect metals. If such discrepancies are noted, prior to further flight, replace with appropriate and correct barrel assemblies. D) Report all defects found in complying with this AD. Such reports must be made in writing and sent to Chief, Engineering and Manufacturing Branch, FAA, Central Region, and should include such items as aircraft serial number, total time in service and nature of defect. (Report approved by the Bureau of the Budget under BOB No. 04-R0174.) This amendment becomes effective February 9, 1972. ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 3A10](https://openairdocs.org/tcds/3A10): Textron Aviation Inc.; names 18 of 23 models: 310I, 310L, 310P, 310A, 310R, 310Q, 310B, 310D… - [TCDS A7CE](https://openairdocs.org/tcds/A7CE): Textron Aviation Inc.; names 13 of 16 models: 421C, 402C, 402B, 414, 402, 421B, 421A, 421… - [TCDS 3A25](https://openairdocs.org/tcds/3A25): Textron Aviation Inc.; names 2 of 11 models: 340A, 340 ## 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: 3,716 (3,716 by airframe model, 0 by engine model) - Makers: Cessna 3,716 Models with the most aircraft: - [Cessna 340A](https://openairdocs.org/model/cessna-340a): 543 aircraft (airframe model) - [Cessna 421C](https://openairdocs.org/model/cessna-421c): 496 aircraft (airframe model) - [Cessna 414A](https://openairdocs.org/model/cessna-414a): 363 aircraft (airframe model) - [Cessna 310R](https://openairdocs.org/model/cessna-310r): 361 aircraft (airframe model) - [Cessna 310Q](https://openairdocs.org/model/cessna-310q): 277 aircraft (airframe model) - [Cessna 414](https://openairdocs.org/model/cessna-414): 242 aircraft (airframe model) - [Cessna 421B](https://openairdocs.org/model/cessna-421b): 225 aircraft (airframe model) - [Cessna 340](https://openairdocs.org/model/cessna-340): 164 aircraft (airframe model) - [Cessna 402C](https://openairdocs.org/model/cessna-402c): 115 aircraft (airframe model) - [Cessna 310](https://openairdocs.org/model/cessna-310): 103 aircraft (airframe model) - [Cessna 310K](https://openairdocs.org/model/cessna-310k): 78 aircraft (airframe model) - [Cessna 310L](https://openairdocs.org/model/cessna-310l): 62 aircraft (airframe model) - [Cessna 310P](https://openairdocs.org/model/cessna-310p): 61 aircraft (airframe model) - [Cessna 310I](https://openairdocs.org/model/cessna-310i): 60 aircraft (airframe model) - [Cessna 310J](https://openairdocs.org/model/cessna-310j): 59 aircraft (airframe model) - [Cessna 310C](https://openairdocs.org/model/cessna-310c): 58 aircraft (airframe model) - [Cessna 310D](https://openairdocs.org/model/cessna-310d): 56 aircraft (airframe model) - [Cessna 310N](https://openairdocs.org/model/cessna-310n): 55 aircraft (airframe model) - [Cessna 402B](https://openairdocs.org/model/cessna-402b): 49 aircraft (airframe model) - [Cessna 310B](https://openairdocs.org/model/cessna-310b): 45 aircraft (airframe model) All 34 models: https://openairdocs.org/ad/72-03-07/models.md Every aircraft: https://openairdocs.org/ad/72-03-07/aircraft.md Its text cites no advisory circulars or STCs. --- 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.