- Effective
- November 2, 1983
- Models
- DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103
- Data sheet
- TCDSA20EA
- Registered aircraft
- 7 matched by model
- Product
- Aircraft · Large airplane
- Amendment
- 39-4753
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 21 KB | b98e062a…3dbb862 | FAA DRS (API key needed) |
On this page
The airworthiness directive
83-21-03 DEHAVILLAND AIRCRAFT OF CANADA, LTD.: Amendment 39-4753. Applies to DeHavilland model DHC-7 airplanes, certificated in all categories, which are equipped with ground spoiler valves installed in accordance with DeHavilland modification No. 7/1732. To detect failures of the pilot valve of the ground spoiler valve No. 2, accomplish the following, unless previously accomplished:
A. Within 25 flight hours from the effective date of this AD, perform an operational check of the ground spoiler system, and take appropriate corrective action, if necessary, in accordance with the Accomplishment Instructions of DeHavilland Aircraft of Canada, Ltd., Alert Service Bulletin A7-27-56, dated June 28, 1983.
B. Repeat the functional checks of paragraph A. at intervals not to exceed 800 flight hours.
C. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest MountainRegion.
D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD.
This amendment becomes effective November 2, 1983.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 7
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1979 | 1 |
|---|---|
| 1981 | 3 |
| 1982 | 1 |
| 1985 | 1 |
1 with no year recorded