# AD 82-12-04: Combined Power Turbine and Propeller Governor Assembly - Type: Airworthiness directive - Status: Current - Products: Cessna 401, 401A, 401B, 402, 402A, 402B, 414, Power turbine and Governor Assemblies, N22B, N24A, 250-B15G, 250-B17 and 2 more - Effective: June 7, 1982 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-4396 - Registered aircraft: 471 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3A483D3D4E7072E886256A3400705FAB.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/82-12-04 ## The airworthiness directive 82-12-04 DETROIT DIESEL ALLISON: Amendment 39-4396. Applies to Detroit Diesel Allison (DDA) combined power turbine and propeller governor assembly, DDA P/N 6875708, (Woodward P/N 8210-018) with the following serial numbers: 904780A 1751790A 1282800A 1751791A 1282910A 1751812A 1282921A 1752008A thru 1752011A 1283049A thru 1283081A 1752015A 1585707A thru 1585740A 1752147A 1704950A thru 1704968A 1752148A 1709149A 1752132A 171127A 1753623A 1713260A thru 1713263A 1753624A 1720002A 1806013A 1720003A 1806047A 1720471A 1807845A 1720472A 1807846A 1720989A 1807957A 1740062A 1807958A 1740063 1808591A 1740231A 1808973A 1743198A 1812386A 1743199A 1812819A 1746476A 1814712A 1746508A 1814713A 1747637A 1816433A 1747638A 1819864A 1747642A thru 1747645A 1820615A thru 1820617A 1747750A 1820648A 1747751A 1821184A 1747817A 1821845A 1747948A 1821854A 1748560A 1821882A 1749652A 1823181A 1750586A 1823182AThe above governors are installed on, or are spares for, Detroit Diesel Allison 250-B15G, B17, B17B, and B17C engines which are installed on, but not limited to, Cessna 401, 401A, 401B, 402, 402A, 402B, and 414 airplanes modified in accordance with STC SA117NW and Government Aircraft Factories (GAF) Nomad N22B and N24A. Compliance is required, unless already accomplished, within the next 50 hours time in service or the next 30 days, whichever occurs first, after the effective date of this AD. a. Complete the ground functional check in accordance with the accomplishment instructions of Detroit Diesel Allison Alert Service Bulletin No. CEB-A-87 or CEB-A-1151, or later FAA-approved revision, as appropriate. b. Governors that fail the check must be removed and replaced with a properly calibrated governor prior to next flight. Equivalent means of compliance may be approved by the Chief, Chicago Aircraft Certification Office, Federal Aviation Administration (FAA), 2300East Devon Avenue, Chicago, Illinois. NOTE: The following service bulletins refer to this subject: DDA No. CEB-A-87, for 250-B15G engines, dated February 5, 1982. DDA No. CEB-A-1151, for 250-B17, -B17B, and -B17C engines, dated February 5, 1982. Woodward No. 33577, dated February 1982. This amendment becomes effective June 7, 1982 ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A7CE](https://openairdocs.org/tcds/A7CE): Textron Aviation Inc.; names 7 of 16 models: 402B, 414, 402, 402A, 401A, 401, 401B - [TCDS E10CE](https://openairdocs.org/tcds/E10CE): Rolls-Royce Corporation; names 4 of 11 models: 250-B17B, 250-B15G, 250-B17C, 250-B17 - [TCDS A7PC](https://openairdocs.org/tcds/A7PC): Nomad TC Pty Ltd; names 2 of 3 models: N22B, N24A ## 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: 471 (353 by airframe model, 118 by engine model) - Makers: Cessna 361, Bell 29, Siai-Marchetti 20, Hiller 15, Enstrom Helicopter 9, Beech 8, Maule 7, Pilatus Britten-Norman 4, Hughes 2, Huizenga Mike 2 Models with the most aircraft: - [Cessna 414](https://openairdocs.org/model/cessna-414): 242 aircraft (airframe model) - [Allison 250 series](https://openairdocs.org/engine/allison-250-series): 79 aircraft (engine model) - [Cessna 402B](https://openairdocs.org/model/cessna-402b): 49 aircraft (airframe model) - [Cessna 401](https://openairdocs.org/model/cessna-401): 21 aircraft (airframe model) - [Cessna 401A](https://openairdocs.org/model/cessna-401a): 15 aircraft (airframe model) - [Cessna 401B](https://openairdocs.org/model/cessna-401b): 15 aircraft (airframe model) - [Allison 250-B17 series](https://openairdocs.org/engine/allison-250-b17-series): 14 aircraft (engine model) - [Allison 250-B15G](https://openairdocs.org/engine/allison-250-b15g): 12 aircraft (engine model) - [Cessna 402](https://openairdocs.org/model/cessna-402): 7 aircraft (airframe model) - [Allison 250-B17C](https://openairdocs.org/engine/allison-250-b17c): 6 aircraft (engine model) - [Rolls-Royce 250-B17C](https://openairdocs.org/engine/rolls-royce-250-b17c): 6 aircraft (engine model) - [Cessna 402A](https://openairdocs.org/model/cessna-402a): 3 aircraft (airframe model) - [Government Aircraft Factories N22B](https://openairdocs.org/model/government-aircraft-factories-n22b): 1 aircraft (airframe model) - [Rolls-Royce 250-B15G](https://openairdocs.org/engine/rolls-royce-250-b15g): 1 aircraft (engine model) All 16 models: https://openairdocs.org/ad/82-12-04/models.md Every aircraft: https://openairdocs.org/ad/82-12-04/aircraft.md ## Related documents - [STC SA117NW](https://openairdocs.org/stc/SA117NW): Installation of Allison 250-B17 or 250-B17B engines and related changes.. Alaskan Turbine S.T.O.L. Aircraft, Cited in the text --- 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.