# AD 77-10-11: Landing Gear Lug - Type: Airworthiness directive - Status: Current - Products: Kelowna Flightcraft R & D 240 Series, 340 and 440 with STC SA1054WE or 2 others - Effective: May 26, 1977 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-2905 - Registered aircraft: 12 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4939C662F699524E862569B5006C9511.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/77-10-11 ## The airworthiness directive 77-10-11 GENERAL DYNAMICS: Amendment 39-2905. Applies to Models 240, 340/440 airplanes, including those modified for turbopropeller power per STC's SA1054WE, SA1096WE and SA4-1100, certificated in all categories. Compliance required as indicated. To detect stress corrosion to the aluminum uplock quadrant lug in the nose landing gear and prevent possible failure of the lug, accomplish the following: a. Within the next 60 hours time in service after the effective date of this AD, and at intervals not to exceed 60 hours time in service thereafter, until (c), below, is performed: (1) Remove the AN 3-21 bolt attaching the nose landing gear uplatch release cable clevis and the emergency release cylinder to the uplock assembly. (2) Inspect P/N 240-5250109-6 nose landing gear uplock quadrant for cracks in the AN3 bolt attach lug using a 2X or stronger magnifier, or dye penetrant method. (3) If cracks are found, prior to further flight, replace the quadrant with either a new aluminum quadrant, P/N 240-5250109-6, or a steel quadrant, P/N 240-5250109-9. If a new aluminum quadrant is installed, perform steps (1) through (4) at intervals not to exceed 600 hours time in service. (4) Reinstall the AN3 bolt attaching release cable and emergency release cylinder and check rigging of the nose landing gear uplock installation per the applicable maintenance manual. b. After the effective date of this AD, all aluminum quadrants, P/N 240-5250109-6, must be replaced before accumulating 1,200 hours time in service. c. Installation of a steel quadrant, P/N 240-5250109-9, constitutes terminating action for this AD, and normal maintenance practices may be observed. d. Special flight permits may be issued in accordance with FAR 21.197 to authorize operation of the aircraft to a base for the accomplishment of the inspections required by this AD. e. Equivalent inspections and replacement parts may be used when approved by the Chief,Aircraft Engineering Division, FAA Western Region. Note: General Dynamics Service Bulletins 600 (240D) Service Bulletin No. 32-3 and 640 (340D) Service Bulletin No. 32-2 pertain to this same subject. This amendment becomes effective May 26, 1977. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 6A6](https://openairdocs.org/tcds/6A6): Kelowna Flightcraft R & D Ltd.; names 2 of 6 models: 340, 440 - [TCDS A-793](https://openairdocs.org/tcds/A-793): Kelowna Flightcraft R & D Ltd.; names 1 of 1 models: 240 Series ## 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: 12 (12 by airframe model, 0 by engine model) - Makers: Convair 12 Models with the most aircraft: - [Convair 340](https://openairdocs.org/model/convair-340): 7 aircraft (airframe model) - [Convair 440](https://openairdocs.org/model/convair-440): 5 aircraft (airframe model) All 2 models: https://openairdocs.org/ad/77-10-11/models.md Every aircraft: https://openairdocs.org/ad/77-10-11/aircraft.md ## Related documents - [STC SA1054WE](https://openairdocs.org/stc/SA1054WE): Installation of Rolls-Royce model Dart 542-4 engines with Dowty Rotol R245/4-40-4.5/13 propellers and associated modifications to engine mounting, nacelle, empennage, accessories, systems and equipment.. Executive Jet Aircraft Co. LTD. c/o Southeast Aero Tek Inc., Named in the applicability - [STC SA1096WE](https://openairdocs.org/stc/SA1096WE): Rolls Royce Dart 542-4 engines with Dowty Rotol (c) R245/4-40-4.5/13 or (c) R259/4-40-4.5/17 propellers and associated modifications.. Kelowna Flightcraft Ltd, Named in the applicability - [STC SA4-1100](https://openairdocs.org/stc/SA4-1100): Installation of Allison model 501-D13D, 501-D13H, or 501-D22G engines and related changes.. Kelowna Flightcraft Ltd, 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.