# AD 72-25-06: Nose Gear Extension - Type: Airworthiness directive - Status: Current - Products: Volpar Mark IV tricycle landing gear (Southwestern Aero Exchange STC SA111WE or 2 others) - Effective: December 9, 1972 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-1572 - Registered aircraft: 250 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/44171079EE2E65FC86256A080071CA05.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/72-25-06 ## The airworthiness directive 72-25-06 BEECH: Amdt. 39-1572. Applies to Beech Models C-45G, TC-45G, C-45H, TC-45H, TC-45J (SNB-5), RC-45J (SNB-5P) D18C, D18S, E18S, E18S-9700, G18S, H18, JRB- 6, 3N, 3NM and 3TM Aircraft certificated in all categories with STC SA4-1531, STC SA111WE, STC SA1832WE or any other STC modification incorporating the provisions of the Volpar TriGear Installation. Compliance required as indicated. To prevent possible failure of the nose landing gear to extend from the retracted position on those aircraft with Volpar TriGear installed, accomplish the following: For airplanes incorporating Volpar Tricycle Landing Gear, within the next 100 hours' time in service after the effective date of this AD unless already accomplished, modify the Volpar nose walking beam assembly, P/N 261, in accordance with Volpar Service Bulletin No. 21, as revised 7 August 1972, or later FAA-approved revision, or an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. NOTE: For bulletins, parts or service information contact: Volpar Incorporated 16300 Stagg Street Van Nuys, California 91406 Phone 213-787-4393 NOTE: Pilots are cautioned to conduct a through pre-flight inspection in this area. A decal should be located on the nose gear shock strut housing listing the recommended strut inflation pressure. This amendment becomes effective December 9, 1972. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A-765](https://openairdocs.org/tcds/A-765): Textron Aviation Inc.; names 16 of 17 models: 3TM, 3N, E18S-9700, TC-45J, TC-45G, C-45H, C-45G, 3NM… ## 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: 250 (250 by airframe model, 0 by engine model) - Makers: Beech 250 Models with the most aircraft: - [Beech D18S](https://openairdocs.org/model/beech-d18s): 55 aircraft (airframe model) - [Beech E18S](https://openairdocs.org/model/beech-e18s): 51 aircraft (airframe model) - [Beech C-45H](https://openairdocs.org/model/beech-c-45h): 50 aircraft (airframe model) - [Beech H-18](https://openairdocs.org/model/beech-h-18): 28 aircraft (airframe model) - [Beech G18S](https://openairdocs.org/model/beech-g18s): 23 aircraft (airframe model) - [Beech 3NM](https://openairdocs.org/model/beech-3nm): 11 aircraft (airframe model) - [Beech C-45G](https://openairdocs.org/model/beech-c-45g): 9 aircraft (airframe model) - [Beech E18S-9700](https://openairdocs.org/model/beech-e18s-9700): 7 aircraft (airframe model) - [Beech TC-45J](https://openairdocs.org/model/beech-tc-45j): 5 aircraft (airframe model) - [Beech RC-45J](https://openairdocs.org/model/beech-rc-45j): 4 aircraft (airframe model) - [Beech 3 TM](https://openairdocs.org/model/beech-3-tm): 3 aircraft (airframe model) - [Beech TC-45G](https://openairdocs.org/model/beech-tc-45g): 2 aircraft (airframe model) - [Beech 3N](https://openairdocs.org/model/beech-3n): 2 aircraft (airframe model) All 15 models: https://openairdocs.org/ad/72-25-06/models.md Every aircraft: https://openairdocs.org/ad/72-25-06/aircraft.md ## Related documents - [STC SA111WE](https://openairdocs.org/stc/SA111WE): Installed Volpar Mark IV tricycle landing gear.. SOUTHWESTERN AERO EXCHANGE INC., Named in the applicability - [STC SA1832WE](https://openairdocs.org/stc/SA1832WE): Installation of Volpar Tricycle Landing Gear.. SOUTHWESTERN AERO EXCHANGE INC., Named in the applicability - [STC SA4-1531](https://openairdocs.org/stc/SA4-1531): Installation of Tricycle landing gear and revised nose assembly with optional radome.. SOUTHWESTERN AERO EXCHANGE INC., Named in the applicability --- 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.