Airworthiness Directive · Amendment 39-15408 · Sierra Hotel Aero, Inc. Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H Airplanes
Sierra Hotel Aero, Inc. Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H Airplanes
This AD applies to Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H airplanes, all serial numbers, that are certificated in any category.
The FAA adopts a new airworthiness directive (AD) for all Sierra Hotel Aero, Inc. (formerly Navion Aircraft LLC) Models Navion (L-17A), Navion A (L-17B), (L-17C), Navion B, Navion D, Navion E, Navion F, Navion G, and Navion H airplanes. This AD requires you to do a one-time inspection of the entire fuel system and repetitive functional tests of certain fuel selector valves. This AD results from reports of airplane accidents associated with leaking or improperly operating fuel selector valves. We are issuing this AD to detect and correct fuel system leaks or improperly operating fuel selector valves, which could result in the disruption of fuel flow to the engine. This failure could lead to engine power loss.
To address this problem, you must do the following actions, unless already done:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Do a one-time inspection of the entire fuel system | Within the next 100 hours time-in-service (TIS) after April 16, 2008 (the effective date of this AD) or within the next 12 months after April 16, 2008 (the effective date of this AD), whichever occurs first | Follow Sierra Hotel Aero, Inc. Navion Service Bulletin No. 106A, dated May 1, 2007; or American Navion Society, Ltd. Field Service Bulletin No. 1001, dated April 30, 2007. |
| (2) Unless within the last 5 years you have replaced the fuel selector valve with one of the valves specified in paragraphs (e)(3)(i) or (e)(3)(ii) of this AD, do the functional tests of the fuel selector valves. If using Sierra Hotel Aero, Inc. service information, you may allow for a 1 inch of mercury reduction from the 24 inches of mercury standard for every 1000 feet of altitude over sea level testing conditions | Initially within the next 100 hours time-in-service (TIS) after April 16, 2008 (the effective date of this AD) or within the next 12 months after April 16, 2008 (the effective date of this AD), whichever occurs first. Repetitively thereafter inspect and do functional tests of the fuel selector valve at intervals not to exceed 12 months until the replacement required by paragraph (e)(3) of this AD is done | Follow Sierra Hotel Aero, Inc. Navion Service Bulletin No. 106A, dated May 1, 2007; or American Navion Society, Ltd. Field Service Bulletin No. 1001, dated April 30, 2007. |
| (3) If during any of the inspections or tests required in paragraphs (e)(1) or (e)(2) of this AD you find any defects, perform any corrective actions required, including replacing the fuel selector valve with one of the part numbers (P/N) specified in paragraphs (e)(3)(i) or (e)(3)(ii) of this AD | Before further flight after any inspection required by this AD where corrective actions are necessary. You may at any time after April 16, 2008 (the effective date of this AD) replace the fuel selector valve with the applicable P/N as specified in the service information as terminating action for the repetitive inspections and functional tests required in paragraph (e)(2) of this AD | (i) For replacement with Navion P/Ns 147-30013-201, 147-30013-202, or 147-30013-203 use the following service information: (A) Sierra Hotel Aero, Inc. Navion Service Bulletin No. 106A, dated May 1, 2007. (B) Sierra Hotel Aero, Inc. Navion Service Bulletin No. 101A, dated August 23, 2005. (C) Navion Aircraft Corporation Navion Service letter #87, dated February 20, 1965. (ii) For replacement with Navion P/Ns 145-48000-ANSI, 145-48000-ANS2, 145-48000-ANS3, or Osborne Tank Co. P/N 4090, submit proposed installation procedures following the alternative method of compliance (AMOC) procedures specified in paragraph (g) of this AD. |
(f) If within the last 5 years or at any time after April 16, 2008 (the effective date of this AD) you have replaced the fuel selector valve with any of the valves specified in paragraphs (e)(3)(i) and (e)(3)(ii) of this AD you may terminate the repetitive inspections and functional tests of the fuel selector valve required in paragraph (e)(2) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
