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Airworthiness directives › 2001-11-10

AD 2001-11-10 Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes

2001-06-21
2001-06-06
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Airframe
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Models named: DHC-8-400 series. Read the applicability below — it usually turns on serial or part numbers too.

Applicability*9

Model DHC-8-400 series airplanes, serial numbers 4002 and subsequent, certificated in any category.

Compliance

Required as indicated, unless accomplished previously. To prevent landing with the main landing gear (MLG) up due to failure of the downlock proximity sensors of the MLG, accomplish the following: Airplane Flight Manual (AFM) Revision (a) Within 14 days after the effective date of this AD, revise the Normal and Abnormal Sections of the FAA-approved AFM by inserting the following into Section 4.21, opposite page 4.21.1. This may be accomplished by inserting a copy of this AD in the AFM. “CAUTION If illumination of LEFT gear safe (green), and LEFT gear unsafe (red), and landing gear handle (amber) advisory lights with the landing gear handle in the up position. Or Illumination of RIGHT gear safe (green), and RIGHT gear unsafe (red), and landing gear handle (amber) advisory lights with the landing gear handle in the up position. 1. Perform an Alternate Landing Gear extension, See paragraph 4.21. WARNING Selection of the gear down without following the Alternate Landing Gear Extension procedure may result in the affected gear being trapped inside the nacelle. 2. Visually inspect Main Landing Gear to confirm that it has been extended. WARNING A down and locked indication of the affected main landing gear is not a valid indication of the gear position. 3. Insert hydraulic pump handle in socket and operate for a minimum of 12 full strokes and ensure resistance to pump handle movement. 4. Observe the LEFT gear safe (green) and RIGHT gear safe (green) advisory lights are illuminated and the LEFT gear unsafe (red) and RIGHT gear unsafe (red) and the landing handle (amber) advisory lights are extinguished.” Alternative Methods of Compliance (b) 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, New York Aircraft Certification Office (ACO), FAA. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. Note 1: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO. Special Flight Permits (c) 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 airplane to a location where the requirements of this AD can be accomplished. Note 2: The subject of this AD is addressed in Canadian airworthiness directive CF-2001-16, dated April 11, 2001. (d) This amendment becomes effective on June 21, 2001. Issued in Renton, Washington, on May 25, 2001. Vi L. Lipski, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 01-13995 Filed 6-5-01; 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