# AD 79-25-07: Alternator Ground - Type: Airworthiness directive - Status: Current - Products: Cessna 180, 180A, 180B, 180C, 180D, 180E, 180F, 180G, 180H, 180J, 180K, 182 and 86 more - Effective: December 13, 1979 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-3633 - Registered aircraft: 21,030 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2B49290E9B9D8414862569A40052B07C.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/79-25-07 ## The airworthiness directive 79-25-07 CESSNA: Amendment 39-3633. Applies to: 180 Series (Serial Numbers 18051762 thru 18052981, except 18052975) airplanes; 182/F182 Series (Serial Numbers 18257446 thru 18266590, F18200001 thru F18200094) airplanes; 185 and A185 Series (Serial Numbers 18501096 thru 18503619) airplanes; 188 and A188 Series (Serial Numbers 18800050 thru 18803240) airplanes; P206 Series (Serial Numbers P20600280 thru P20600647) airplanes; U206 and TU206 Series (Serial Numbers 20600634 thru 20604649) airplanes; 207 and T207 Series (Serial Numbers 20700001 thru 20700451) airplanes; 210 and T210 Series (Serial Numbers 21058783 thru 21062649, 21062651 thru 21062661, 21062663 thru 21062666, T210-0001 thru T210-0454) airplanes; Model P210N (Serial Numbers P21000001 thru P21000026) airplanes. COMPLIANCE: Required within the next 50 hours' time-in-service after the effective date of this AD unless previously accomplished. To preclude the possibility of electrical orelectronic component damage or an in-flight fire due to a short between an ungrounded alternator and flammable fluid carrying lines, accomplish the following: A) Perform either 1 or 2 below: 1) Install an additional ground strap, Cessna P/N 1570102-22, between the ground stud on the alternator and the lower left hand mounting stud on the engine auxiliary drive pad in accordance with Cessna Single Engine Service Information Letter SE79-59. An equivalent ground strap fabricated per FAA Advisory Circular 43.13-1A appropriate for the alternator rating is also acceptable. 2) Modify the alternator installation by installing a different engine mount leg per Cessna Service Kit SK210-84 (Reference Cessna Single Engine Customer Care Service Information Letter SE79-5, dated February 26, 1979) or for the 182 Series, Cessna Service Kit SK182-55A (Reference Cessna Single Engine Customer Care Service Information Letter SE79-58 dated November 23, 1979). NOTE: When accomplishing Paragraph 1) or 2), assure all contact areas are clean and provide good electrical continuity. B) Visually inspect the alternator installation for, and if necessary, provide at least 1/2 inch clearance between the alternator installation and adjacent flammable fluid carrying lines, powerplant controls and electrical wiring in accordance with FAA Advisory Circular 43.13-1A. C) Visually inspect the existing alternator to airframe ground for proper installation (Reference View A-A of SE79-59), evidence of looseness at the terminal and adequate length to allow for relative motion between the alternator and airframe. Also, visually verify that the ground straps between the engine and airframe mount are installed and provide continuity between the engine and mount. Correct any unsatisfactory conditions noted per FAA Advisory Circular 43.13-1A. D) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. E) Any equivalent method of compliance with this Airworthiness Directive must be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Central Region, 601 E. 12th Street, Kansas City, Missouri 64106. Cessna Single Engine Customer Care Service Information Letters SE79-5 dated February 26, 1979, SE79-58 dated November 23, 1979, and SE79-59 dated November 23, 1979, pertain to the subject matter of this AD. This amendment becomes effective December 13, 1979. ## Affected data sheets (8) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 3A21](https://openairdocs.org/tcds/3A21): Textron Aviation Inc.; names 27 of 28 models: 210J, P210N, 210D, 210R, T210M, 210, 210M, 210-5A (205A)… - [TCDS A4CE](https://openairdocs.org/tcds/A4CE): Textron Aviation Inc.; names 21 of 29 models: TU206A, U206, P206C, P206E, P206A, TU206D, TU206C, TU206F… - [TCDS 3A13](https://openairdocs.org/tcds/3A13): Textron Aviation Inc.; names 19 of 23 models: 182D, 182A, 182J, 182P, 182B, 182L, 182G, 182Q… - [TCDS 5A6](https://openairdocs.org/tcds/5A6): Textron Aviation Inc.; names 11 of 11 models: 180E, 180J, 180F, 180H, 180A, 180, 180B, 180D… - [TCDS 3A24](https://openairdocs.org/tcds/3A24): Textron Aviation Inc.; names 8 of 8 models: 185B, A185F, 185E, 185C, A185E, 185A, 185D, 185 - [TCDS A9CE](https://openairdocs.org/tcds/A9CE): Textron Aviation Inc.; names 6 of 7 models: A188A, A188B, 188A, 188, A188, 188B - [TCDS A16CE](https://openairdocs.org/tcds/A16CE): Textron Aviation Inc.; names 4 of 4 models: 207, T207, 207A, T207A - [TCDS A42EU](https://openairdocs.org/tcds/A42EU): Textron Aviation Inc.; names 2 of 3 models: F182P, F182Q ## 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: 21,030 (21,030 by airframe model, 0 by engine model) - Makers: Cessna 20,680, Textron 347, Cessna Wren 3 Models with the most aircraft: - [Cessna 182P](https://openairdocs.org/model/cessna-182p): 2,099 aircraft (airframe model) - [Cessna 182Q](https://openairdocs.org/model/cessna-182q): 1,565 aircraft (airframe model) - [Cessna 180](https://openairdocs.org/model/cessna-180): 1,177 aircraft (airframe model) - [Cessna A185F](https://openairdocs.org/model/cessna-a185f): 1,109 aircraft (airframe model) - [Cessna 182T](https://openairdocs.org/model/cessna-182t): 968 aircraft (airframe model) - [Cessna 182A](https://openairdocs.org/model/cessna-182a): 784 aircraft (airframe model) - [Cessna 182S](https://openairdocs.org/model/cessna-182s): 606 aircraft (airframe model) - [Cessna 182J](https://openairdocs.org/model/cessna-182j): 487 aircraft (airframe model) - [Cessna 182R](https://openairdocs.org/model/cessna-182r): 487 aircraft (airframe model) - [Cessna T210N](https://openairdocs.org/model/cessna-t210n): 466 aircraft (airframe model) - [Cessna 182](https://openairdocs.org/model/cessna-182): 446 aircraft (airframe model) - [Cessna 182M](https://openairdocs.org/model/cessna-182m): 432 aircraft (airframe model) - [Cessna 182H](https://openairdocs.org/model/cessna-182h): 423 aircraft (airframe model) - [Cessna P210N](https://openairdocs.org/model/cessna-p210n): 418 aircraft (airframe model) - [Cessna 182K](https://openairdocs.org/model/cessna-182k): 413 aircraft (airframe model) - [Cessna 182L](https://openairdocs.org/model/cessna-182l): 411 aircraft (airframe model) - [Cessna 182B](https://openairdocs.org/model/cessna-182b): 406 aircraft (airframe model) - [Cessna 182G](https://openairdocs.org/model/cessna-182g): 391 aircraft (airframe model) - [Cessna 182E](https://openairdocs.org/model/cessna-182e): 380 aircraft (airframe model) - [Cessna 180H](https://openairdocs.org/model/cessna-180h): 366 aircraft (airframe model) All 110 models: https://openairdocs.org/ad/79-25-07/models.md Every aircraft: https://openairdocs.org/ad/79-25-07/aircraft.md ## Related documents - [AC 43.13-1B CHG 1 Ed Update](https://openairdocs.org/ac/43.13-1): Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair. Cited as AC 43.13-1A in the AD's requirements --- 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.