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2008-24-10: Fuel Control Hydro Mechanical Unit (HMU) P3 servo

FAA order 2008-24-10 is an airworthiness directive in force since January 2, 2009. The FAA's subject line: Fuel Control Hydro Mechanical Unit (HMU) P3 servo. It names the Pratt & Whitney Canada JT15D-5, Pratt & Whitney Canada JT15D 5 series, Pratt & Whitney Canada JT15D-5R engines: about 535 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Pratt & Whitney Canada Corp.
Models: JT15D-5, JT15D-5B, JT15D-5F, JT15D-5R
Engine series: Pratt & Whitney Canada JT15D-5 42 aircraft
Pratt & Whitney Canada JT15D 5 series 451 aircraft
Pratt & Whitney Canada JT15D-5R 42 aircraft

Dates and paperwork

In force since: January 2, 2009
Published: November 28, 2008 (signed November 19, 2008)
Docket: FAA-2008-0752
Status: Current
The FAA's document: Read the order on the FAA's site

The FAA's summary their words, unchanged

We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as follows: There have been several reported incidents of high altitude, dual engine flameout on JT15D-5 engine powered aircraft operating in certain meteorological conditions. Subsequent to the investigation of incidents, review of the engine design has revealed that the Fuel Control Hydro Mechanical Unit (HMU) P3 servo can be exposed to excessive moisture and freezing. We are issuing this AD to prevent engine flameouts of one or both engines, caused by excessive moisture and freezing in the P3 servo during certain flight conditions.

The order itself the regulatory text, as published

Show the full text (4,730 characters)

2008-24-10 Pratt & Whitney Canada Corp.: Amendment 39-15750. Docket No. FAA-2008-0752; Directorate Identifier 2008-NE-22-AD. 

Effective Date 

	(a) This airworthiness directive (AD) becomes effective January 2, 2009. 

Affected ADs 

	(b) None. 

Applicability 

	(c) This AD applies to the following Pratt & Whitney Canada Corp. (P&WC) turbofan engines with compressor air to HMU delivery tube, part number (P/N) 3119150-01 installed: 

	(1) JT15D-5 turbofan engines, serial numbers (SNs) below and including SN PCE-100411. 

	(2) JT15D-5 turbofan engines, SNs below and including SN PCE- JA0818. 

	(3) All JT15D-5B turbofan engines. 

	(4) All JT15D-5F turbofan engines. 

	(5) JT15D-5R turbofan engines SNs below and including SN PCE- JG0104. 

	(6) All JT15D-5 turbofan engines converted to model JT15D-5R by incorporation of P&WC Service Bulletin No. 7605. 
	These engines are installed on, but not limited to, Hawker Beechcraft models 400, 400A, and 400T airplanes.Reason 

	(d) Transport Canada AD CF-2008-23, dated June 27, 2008, states: 

	There have been several reported incidents of high altitude, dual engine flameout on JT15D-5 engine powered aircraft operating in certain meteorological conditions. Subsequent to the investigation of incidents, review of the engine design has revealed that the Fuel Control Hydro Mechanical Unit (HMU) P3 servo can be exposed to excessive moisture and freezing. To preclude P3 servo freezing, P&WC has issued JT15D Alert Service Bulletin (ASB) JT15D-72-A7611 to re- route compressor delivery air to the HMU and improve moisture separation. Considering the potentially hazardous consequence of possible in-flight dual engine flameout, this airworthiness directive is issued to mandate the incorporation of P&WC ASB JT15D- 72-A7611 to the affected JT15D-5 engines, in order to minimize the possibility of this hazard. 

	We are issuing this AD to prevent engine flameouts of one or both engines caused by excessivemoisture and freezing in the P3 servo during certain flight conditions. 

Actions and Compliance 

	(e) Unless already done, do the following actions. 

	(1) Within 200 flight hours after the effective date of this AD or within 30 days after the effective date of this AD, whichever occurs first, remove from service compressor air to HMU delivery tube, P/N 3119150-01. 

	(2) Install a serviceable compressor air to HMU delivery tube in accordance with P&WC Alert Service Bulletin (ASB) No. JT15D-72- A7611, Revision 1, dated June 16, 2008. 

Prohibition of Compressor Air to HMU Delivery Tube, P/N 3119150-01 

	(3) After the effective date of this AD, do not install any compressor air to HMU delivery tube, P/N 3119150-01, onto any engine. 

Definition 

	(f) For the purpose of this AD, a serviceable compressor air to HMU delivery tube is a compressor air to HMU delivery tube that is other than the tube part number listed in this AD. 

	(g) Alternative Methods of Compliance(AMOCs): The Manager, Engine Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. 

Previous Credit 

	(h) Replacement of the compressor air to HMU delivery tube using P&WC ASB No. JT15D-72-A7611, dated March 26, 2008, before the effective date of this AD, meets the requirements of this AD. 

Related Information 

	(i) Refer to Transport Canada AD CF-2008-23, dated June 27, 2008, for related information. 

	(j) Hawker Beechcraft Service Bulletin No. SB 73-3888, Revision 1, dated July 2008, also pertains to the subject of this AD. 

	(k) Contact Ian Dargin, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park; Burlington, MA 01803; e-mail: ian.dargin@faa.gov; telephone (781) 238-7178; fax (781) 238-7199, for more information about this AD. 

Material Incorporated by Reference 

	(l) You must use Pratt & Whitney Canada Corp. Alert Service Bulletin No. JT15D-72-A7611, Revision 1, dated June 16, 2008, to do the actions required by this AD, unless the AD specifies otherwise. 

	(1) The Director of the Federal Register approved the incorporation by reference of this service information under 5 U.S.C. 552(a) and 1 CFR part 51. 

	(2) For service information identified in this AD, contact Pratt & Whitney Canada Corp., 1000 Marie-Victorin, Longueuil, Quebec, Canada J4G 1A1, telephone: (800) 268-8000. 

	(3) You may review copies at the FAA, New England Region, 12 New England Executive Park, Burlington, MA; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 5, 2026. Connections as data: /graph/directive/2008-24-10.json · aircraft systems.