# AD 64-05-05: Throttle Valve Assemblies - Type: Airworthiness directive - Status: Current - Products: Pratt & Whitney Division JT3C-12, JT3C-7, JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-1A, JT3D-1A-MC6, JT3D-1A-MC7, JT3D-3, JT3D-3B, JT3D-3C, JT3D-5A and 8 more - Effective: February 27, 1964 - Superseded by: Nothing supersedes this AD - Product type: Engine - Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6B2462267773A3B8862569D000573C74.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/64-05-05 ## The airworthiness directive 64-05-05 PRATT & WHITNEY: Amdt. 691 Part 507 Federal Register February 27, 1964. Applies to All JT3C-7, JT3C-12, and JT3D Series Turbofan Engines, and JT4A Series Turbojet Engines. Compliance required as indicated. To preclude severe engine damage as the result of the engine fuel control throttle valve packing leakage, accomplish the following on all Hamilton Standard JFC25 engine fuel controls incorporating aluminum throttle valve assemblies. (a) For throttle valve assemblies previously overhaul by the procedure described in (d) or engine fuel controls Serial Numbers 34550 and up, overhaul in accordance with (d) at every engine fuel control overhaul. (b) For throttle valve assemblies previously overhauled with low burnish finish or unknown burnish finish packings P/N's 562026-28 and -29 and with the following new aluminum parts: throttle valve piston, throttle valve rod and throttle valve lower cylinder, overhaul in accordance with (d) as follows: (1) Overhaul throttle valve assemblies with 2,500 or more hours' time in service since last throttle valve assemblies overhaul or since new, within the next 100 hours' time in service after the effective date of this AD and at every engine fuel control overhaul thereafter. (2) Overhaul throttle valve assemblies with less than 2,500 hours' time in service since last throttle valve assembly overhaul or since new, prior to the accumulation of 2,600 hours' time in service since last throttle valve assembly overhaul or since new and at every engine fuel control overhaul thereafter. (c) For throttle valve assemblies previously overhauled with low burnish, unknown burnish finish or high burnish finish packings, P/N's 562026-28 and -29 and any of the following used aluminum parts: throttle valve piston, throttle valve rod and throttle valve lower cylinder, overhaul in accordance with (d) as follows: (1) Overhaul throttle valve assemblies with 1,100 or more hours' time in service since last throttle valve assemblies overhaul, within the next 100 hours' time in service after the effective date of this AD and every engine fuel control overhaul thereafter. (2) Overhaul throttle valve assemblies with less than 1,100 hours' time in service since last throttle valve assembly overhaul prior to the accumulation of 1,200 hours' time in service since last throttle valve assembly overhaul and at every engine fuel control overhaul thereafter. (d) Replace the packings P/N's 562026-28 and -29 with new high burnish finish packings, P/N's 562026-28 and -29. In addition, replace the aluminum throttle valve piston, throttle valve rod, and throttle valve lower cylinder with a new aluminum throttle valve piston, throttle valve rod, and throttle valve lower cylinder. Conduct a complete fuel control calibration after incorporation of the new parts. (e) Upon the request of the operator an FAA maintenance inspector, subject to prior approval of the Chief, Engineering andManufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator. (Pratt & Whitney Aircraft telegraphic messages dated August 5 and 27, and October 30, 1963, to all JT3C-7, JT3C-12, JT3D Series, and JT4A Series operators cover this same subject.) This directive effective February 27, 1964. ## Affected data sheets (4) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1E8](https://openairdocs.org/tcds/1E8): Pratt & Whitney Division; names 11 of 11 models: JT3D-3, JT3D-3C, JT3D-1A-MC7, JT3D-1-MC6, JT3D-7, JT3D-1-MC7, JT3D-1A, JT3D-3B… - [TCDS E-291](https://openairdocs.org/tcds/E-291): Pratt & Whitney Division; names 6 of 6 models: JT4A-11, JT4A-3, JT4A-9, JT4A-10, JT4A-5, JT4A-12 - [TCDS E-290](https://openairdocs.org/tcds/E-290): Pratt & Whitney Division; names 2 of 4 models: JT3C-7, JT3C-12 - [TCDS E3EA](https://openairdocs.org/tcds/E3EA): Pratt & Whitney Division; names 1 of 3 models: JT3D-5A ## 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: 5 (0 by airframe model, 5 by engine model) - Makers: Boeing 3, Mcdonnell Douglas 2 Models with the most aircraft: - [Pratt & Whitney JT3D-3B](https://openairdocs.org/engine/pratt-whitney-jt3d-3b): 3 aircraft (engine model) - [Pratt & Whitney JT3D series](https://openairdocs.org/engine/pratt-whitney-jt3d-series): 2 aircraft (engine model) All 2 models: https://openairdocs.org/ad/64-05-05/models.md Every aircraft: https://openairdocs.org/ad/64-05-05/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.