Airworthiness directives › 99-01-09
AD 99-01-09 Airworthiness Directives; Sikorsky Aircraft Corporation Model S- 76C Helicopters
Models named: S-76C. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
Model S-76C helicopters, serial numbers 760477, 760479, 760481 through 760487, 760490, 760491 and 760493, certificated in any category. Note 1: This AD applies to each helicopter identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (d) to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition, or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any helicopter from the applicability of this AD.
Compliance
Required as indicated, unless accomplished previously. To prevent air from getting into a fuel supply line when there is less than 250 lbs. of fuel in either fuel tank, engine flame-out, and a subsequent forced landing, accomplish the following: (a) Before further flight: (1) Revise the Rotorcraft Flight Manual (RFM) by inserting this AD in the Operating Limitations section of the RFM. (2) Install a placard, made with block letters on a contrasting background, adjacent to the fuel quantity gauge that states: ``No flight operations to be conducted with less than 250 lbs. fuel in each fuel tank.'' (b) Within 50 hours time-in-service or 30 calendar days, whichever occurs first, perform the following: (1) Defuel both fuel tanks until the #1 FUEL LOW and #2 FUEL LOW warning lights illuminate. (2) Start the No. 1 engine with the fuel lever in direct feed position. (3) Monitor the engine start for the following: (i) Slow start (N1 speed does not reach 59-65% within 20-40 seconds). (ii) Loss of fuel prime. (iii) Sputtering or surging. (iv) Flameout. (4) If engine start is normal, shut down the engine and allow it to cool down. (5) If any of the conditions specified in paragraph (3) is encountered, shut down the engine and allow it to cool down. Inspect all portions of the fuel suction lines for unseated fittings or pitting or corrosion. If corrosion or pitting is present, replace any affected component with an airworthy component. If any fitting is unseated, reinstall it. (6) Repeat steps (2) through (5) with the fuel lever in the crossfeed position. (7) Repeat steps (2) through (6) for the No. 2 engine. (c) After accomplishing paragraph (b), remove this AD from the RFM and remove the cockpit placard. Accomplishment of these actions constitutes a terminating action for the requirements of this AD. Note 2: Maintenance Manual SA 4047-76C-2, Chapter 28, Paragraph 28-20-02, Step 2, pertains to this AD. (d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Boston Aircraft Certification Office, FAA. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Boston Aircraft Certification Office. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Boston Aircraft Certification Office. Note 4: Sikorsky Aircraft Company Alert Service Bulletin 76-28- 4, dated December 11, 1998, pertains to this AD. (e) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the helicopter to a location where the requirements of this AD can be accomplished provided there is a minimum of 250 lbs. of fuel in each fuel tank. (f) This amendment becomes effective on March 3, 1999, to all persons except those persons to whom it was made immediately effective by Priority Letter AD 99-01-09, issued December 22, 1998, which contained the requirements of this amendment. Issued in Fort Worth, Texas, on February 5, 1999. Eric Bries, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 99-3587 Filed 2-12-99; 8:45 am] BILLING CODE 4910-13-U
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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