| AD Number | 90-25-16 | Status | Active |
| Effective Date | January 14, 1991 | Issue Date | Not specified |
| Docket Number | 90-NM-147-AD | Amendment | 39-6827 |
| Product Type | ["Aircraft"] | Product Subtype | ["Large Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Viking Air Limited |
| Model(s) | DHC-7-1 DHC-7-100 DHC-7-101 DHC-7-102 DHC-7-103 |
90-25-16 BOEING OF CANADA, LTD., DE HAVILLAND DIVISION: Amendment 39- 6827. Docket No. 90-NM-147-AD.
Applicability: All de Havilland Model DHC-7 series airplanes, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent possible malfunction of the right main landing gear (MLG), accomplish the following:
A. Within 100 landings after May 29, 1990 (the effective date of AD 90-09-02), and thereafter at intervals not to exceed 500 landings, conduct a visual inspection of the right MLG frame and attachment bolts, in accordance with paragraph A. of the Accomplishment Instructions in de Havilland Service Bulletin No. 7-24-66, Revision B, dated June 23, 1989.
1. If no damage is found, reassemble parts and return the airplane to service.
2. If damage is found, replace with serviceable parts prior to further flight, in accordance with the service bulletin.
B. Within 180 days after the effective date ofthis AD, install Modification No. 7/2577, which relocates the external power grounding stud, in accordance with paragraph B of the Accomplishment Instructions in de Havilland Service Bulletin No. 7-24-66, Revision B, dated June 23, 1989. Installation of this modification constitutes terminating action for the repetitive inspections required by paragraph A., above.
C. 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, New York Aircraft Certification Office (ACO), ANE-170.
NOTE: The request should be submitted directly to the Manager, New York Aircraft ACO, ANE-170, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, New York ACO, ANE-170.
D. 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 of Canada, Ltd., de Havilland Division, Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the FAA, New England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Valley Stream, New York.
Airworthiness Directive 90-25-16 supersedes AD 90-09-02, Amendment 39-6579.
This amendment (39-6827, AD 90-25-16) becomes effective on January 14, 1991.