AD 91-05-08

91-05-08 BOEING: Amendment 39-6906. Docket No. 90-NM-131-AD.

Applicability: Model 737 series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent loss of engine control due to engine control cable separation resulting from corrosion, accomplish the following:

A. Within the next 36 months after the effective date of this AD, inspect the engine control cable system as listed in Boeing Service Letters 737-SL-76-2-A, dated August 25, 1977, for Models 737- 100 and -200 series airplanes; and 737-SL-76-9, dated November 21, 1990, for Models 737-300 and -400 series airplanes; for the type of cable installed.

NOTE: Determination of cable(s) part number by review of maintenance records is considered acceptable in lieu of actual inspection.

1. If corrosion resistant stainless steel cables are installed, no further action is necessary.

2. If carbon steel cables are installed and found tobe:

(a) unserviceable, replace the cables in accordance with the appropriate Boeing Service Letter prior to further flight

(b) serviceable, replace the cables in accordance with the appropriate Boeing Service Letter within three years of the effective date of this AD.

B. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington.

This amendment (39-6906, AD 91-05-08) becomes effective on March 25, 1991.