AD 89-03-13

89-03-13 SAAB-SCANIA: Amendment 39-6136. Applicability: Model SF-340A series airplanes, serial numbers -003 through -138, inclusive, certificated in any category.

Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished.

To prevent erroneous airspeed readings due to ice in the pitot system, accomplish the following:

A. Install water traps and insulation pads in the main and standby pitot systems, in accordance with SAAB-Scania Service Bulletin SF340-34-056, dated August 1, 1988.

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, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who may add any comments and then send it to the Manager, Standardization Branch, ANM-113.

C. Special flightpermits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of 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 SAAB-Scania, Product Support, S-58188, Linkoping, Sweden. These documents may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6136, AD 89-03-13) becomes effective March 15, 1989.