Airworthiness directives › 2004-04-01
AD 2004-04-01 Airworthiness Directives; Pilatus Aircraft Ltd. Models PC-7, PC-12, and PC-12/45 Airplanes
Makes named: pilatus. Models named: PC-12, PC-12/45, PC-7. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
(c) This AD affects the following airplane models and serial numbers that are certificated in any category: Model Serial numbers (1) PC-7 All manufacturer serial numbers (MSN) equipped with either a Lear Romec part number (P/N) RG9570M (Pilatus P/N 968.84.51.103) engine-driven pump or a Lear Romec P/N RG9570M1 (Pilatus P/N 968.84.51.105) engine-driven pump. (2) PC-12 and PC-12/45 All MSN equipped with a Lear Romec P/N RG9570R1 (Pilatus P/N 968.84.51.106) engine-driven pump. Note: Pilatus installed these engine-driven pumps on MSN 101 through MSN 406 and MSN 408 through 419 of the Models PC-12 and PC-12/45 airplanes and MSN 101 through MSN 618 of the Model PC-7 airplanes. These engine-driven pumps could be installed through field approval on any MSN of the Models PC-7, PC-12, and PC-12/45 airplanes.
Required actions
(e) To address this problem, you must do the following: (1) Inspection: Inspect the joints between the engine-driven pump housing, the relief valve housing, and the relief valve cover for signs of fuel leakage and extruding gasket material as follows: Engine-driven pump P/N Compliance Procedures (i) Lear Romec P/N RG9570M1 (Pilatus P/N 968.84.51.105) or Lear Romec P/N RG9570R1 (Pilatus P/N 968.84.51.106) Within the next 20 hours time-in-service (TIS) after February 28, 2002 (the effective date of AD 2002-01-09) or within the next 30 days after February 28, 2002 (the effective date of AD 2002-01-09), whichever occurs first, unless already done Follow Pilatus PC-7 Service Bulletin No. 28-006 or Pilatus PC-12 Service Bulletin No. 28-009, both dated August 10, 2001, as applicable. (ii) Lear Romec P/N RG9570M (Pilatus P/N 968.84.51.103) Within the next 20 hours TIS after March 29, 2004 (the effective date of this AD) or within 30 days after March 29, 2004 (the effective date of this AD), whichever occurs first, unless already done Follow Pilatus PC-7 Service Bulletin No. 28-008, Revision 1, dated September 24, 2002. (2) Replacement/Modification: Replace the engine-driven pump with one of the following before further flight after the inspection in paragraph (e)(1) of this AD if you find signs of fuel leakage or extruding gasket material or within 6 months after March 29, 2004 (the effective date of this AD) if you do not find signs of fuel leakage or extruding gasket material, unless already done: Models Pump replacement P/N Procedures (i) PC-7 Lear Romec P/N RG9570M1/M(Pilatus P/N 968.84.51.107) Pilatus PC-7 Service Bulletin No. 28-007, Revision No. 1, dated October 1, 2002. (ii) PC-12 and PC-12/45 Lear Romec P/N RG9570R1/M(Pilatus P/N 968.84.51.108) Pilatus PC-12 Service Bulletin No. 28-010, and dated September 16, 2002. (3) Relief Valve Attachment Screw Torque: Before further flight after the inspection (if you find no fuel leakage or extruding gasket material) and replacement required by this AD, ensure that the relief valve attachment screws are adequately torqued and re-torqued as necessary using the following: (i) For Pilatus Model PC-7 Airplanes: Pilatus PC-7 Service Bulletin No. 28-006, dated August 10, 2001, or Pilatus PC-7 Service Bulletin No. 28-008, Revision 1, dated September 24, 2002. (ii) For Pilatus Models PC-12 and PC-12/45 Airplanes: Pilatus PC-12 Service Bulletin No. 28-009, dated August 10, 2001. (4) Spares: As of March 29, 2004 (the effective date of this AD), install only an engine-driven pump that is a part number referenced in paragraphs (e)(2)(i) and (e)(2)(ii) of this AD. Before further flight after installation, do the relief valve attachment screw torque check as required by paragraph (e)(3) of this AD. (5) Unless Already Done Credit: This AD retains actions from AD 2002-01-09. (i) You may take inspection credit if you have one of the engine-driven pumps installed affected by AD 2002-01-09 and the specific actions are already done. (ii) The actions of this AD do not apply if you have one of the engine-driven pumps installed that is referenced in paragraphs (e)(2)(i) and (e)(2)(ii) of this AD.
Unsafe condition
(d) The actions specified in this AD are intended to detect and correct gasket material extruding from the engine-driven pump housing and detect and correct relief valve attachment screws with inadequate torque. These conditions could lead to fuel leakage and result in a fire in the engine compartment.
Affected ADs
(b) This AD supersedes AD 2002-01-09, Amendment 39-12600.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1