AD 90-05-10

Final rule

90-05-10 SAAB-SCANIA: Amendment 39-6530. Docket No. 90-NM-19-AD.
Applicability: Model SF-340A series airplanes, Serial Numbers 004 through 159; and SAAB 340B series airplanes, Serial Numbers 160 through 166; certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent the loss of structural integrity of the powerplant installation, accomplish the following:

A. Within 50 hours time-in-service after the effective date of this AD, inspect the drag strut bolts, lower fittings, and attaching bolts to verify the type of nuts/collars installed, in accordance with SAAB Service Bulletin 340-54-026, dated December 1, 1989.

1. If the inboard and outboard lower drag strut support fittings have been installed with Hi-Lock pins and MS nuts, Part No. MS21042L3, no further action is required.

2. If the inboard and outboard lower drag strut support fittings have not been installed with MS21042L3 nuts, prior to further flight, accomplish the following:

a. Remove the seven collars at the lower drag strut support fitting, in accordance with Figure 1 of the service bulletin.

b. Perform a visual inspection for defects around the hole edges. If defects are found, repair prior to further flight, in a manner approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.

c. Install MS21042L3 nuts, and AN960KD10 or AN960KD10L washers, in accordance with paragraph 2.B.(4) of the service bulletin.

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 will either concur or comment and then send it to the Manager, Standardization Branch, ANM-113.

C. Special flight permits may be issuedin 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 information from the manufacturer may obtain copies upon request to SAAB-Scania, Product Support, S- 581.88, Linkoping, Sweden. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6530, AD 90-05-10) becomes effective on March 21, 1990.