# AD 72-14-08 R1: Flexible Hose Assemblies - Type: Airworthiness directive - Status: Current - Products: Cessna 310, 310A, 310B, 310C, 310D, 310E, 310F, 310G, 310H, 310I, 310J, 310J-1 and 24 more - Effective: September 4, 1981 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-4215 - Registered aircraft: 1,579 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AB5ADE6BCEFD584F86256A3400635A72.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/72-14-08-R1 ## The airworthiness directive 72-14-08 R1 CESSNA: Amendment 39-1484 as amended by Amendment 39-4215. Applies to Models 310, 320, 401, 402, 411 and 421 series airplanes. On airplanes having 200 hours or more time-in-service and thereafter at intervals not to exceed 60 hours time-in-service, to determine condition of flammable fluid-carrying flexible hose assemblies in the engine compartment, accomplish the following: A. Visually, or by any other method approved by FAA, inspect flexible fuel lines as follows: (1) Pressurize the fuel lines with boost pump momentarily operating in prime position. When accomplishing this test, the mixture control should be in the idle cutoff position. While under pressure, examine all hose exteriors in the engine compartment for evidence of leakage such as wetness and fuel stains. NOTE: After pressure testing fuel hoses, allow sufficient time for excess fuel to drain overboard from the engine manifold before attempting an engine start. (2) Examine externally all hoses in the engine compartment for evidence of deterioration or damage such as cracks, cuts, bulges, discoloration, hardness, chafing and excessive wear. B. Visually, or by any other method approved by FAA, inspect flexible oil lines as follows: (1) Examine all hose exteriors in the engine compartment for evidence of leakage. (2) Examine externally all hoses in the engine compartment for evidence of deterioration or damage such as cracks, cuts, bulges, discoloration, hardness, chafing and excessive wear. C. If, as a result of the inspections required by Paragraphs A or B, leakage or other evidence of deteriorated or damaged hose assembly is found, replace with serviceable hose assembly prior to further flight. NOTE: Cessna Service Letter ME68-23, dated November 1, 1968, and applicable Cessna Service Manuals pertain to paragraphs A, B, and C. D. This AD does not apply to the following airplanes which were manufactured with improved fuel and oil system flexible hose assemblies in the engine compartment: Model Serial Number 310R 310R0001 and on 402C 402C0001 and on 421C 421C0001 and on E. This AD does not apply to those airplanes which have improved fuel and oil system flexible hose assemblies installed in the engine compartment in accordance with Cessna Service Information Letter ME81-17 dated July 10, 1981. F. Any equivalent method of compliance with this Airworthiness Directive must be approved by the Chief, Aircraft Certification Program, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209, telephone (316) 942-4285. Amendment 39-1484 became effective July 14, 1972. This amendment 39-4215 becomes effective September 4, 1981. ## 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 17 of 23 models: 310I, 310L, 310P, 310A, 310Q, 310B, 310D, 310… - [TCDS A7CE](https://openairdocs.org/tcds/A7CE): Textron Aviation Inc.; names 11 of 16 models: 402B, 411A, 402, 421B, 421A, 411, 421, 402A… - [TCDS 3A25](https://openairdocs.org/tcds/3A25): Textron Aviation Inc.; names 8 of 11 models: 320, 320D, 320-1, 320B, 320E, 320C, 320F, 320A ## 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: 1,579 (1,579 by airframe model, 0 by engine model) - Makers: Cessna 1,579 Models with the most aircraft: - [Cessna 310Q](https://openairdocs.org/model/cessna-310q): 277 aircraft (airframe model) - [Cessna 421B](https://openairdocs.org/model/cessna-421b): 225 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) - [Cessna 310F](https://openairdocs.org/model/cessna-310f): 41 aircraft (airframe model) - [Cessna 310G](https://openairdocs.org/model/cessna-310g): 41 aircraft (airframe model) - [Cessna 310H](https://openairdocs.org/model/cessna-310h): 33 aircraft (airframe model) - [Cessna 320D](https://openairdocs.org/model/cessna-320d): 30 aircraft (airframe model) - [Cessna 421](https://openairdocs.org/model/cessna-421): 28 aircraft (airframe model) - [Cessna 320E](https://openairdocs.org/model/cessna-320e): 27 aircraft (airframe model) - [Cessna 320C](https://openairdocs.org/model/cessna-320c): 23 aircraft (airframe model) All 35 models: https://openairdocs.org/ad/72-14-08-R1/models.md Every aircraft: https://openairdocs.org/ad/72-14-08-R1/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.