AD 69-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | FAIRCHILD-HILLER Model F-27 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27A | FAIRCHILD-HILLER Model F-27 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27B | FAIRCHILD-HILLER Model F-27 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27F | FAIRCHILD-HILLER Model F-27 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27G | FAIRCHILD-HILLER Model F-27 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27J | FAIRCHILD-HILLER Model F-27 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27M | FAIRCHILD-HILLER Model F-27 Airplanes |
Unsafe Condition
Flap drive system failure whereby the flaps are driven off the drive screw jacks due to contact pitting or discoloration of contacts in the Cutler Hammer P/N 6046 H46 Relay.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect contacts of the flap control system relay every 200 hours time in service; replace relay if contacts are pitted or discolored. Rewire the flap drive circuit per Service Bulletin F-27-27-67 or equivalent modification within 500 hours time in service after the effective date.
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Compliance Time
Within the next 200 hours time in service after the effective date of this AD, and thereafter at 200 hour intervals from the date of the last inspection for inspections. Rewiring must be done within the next 500 hours time in service after the effective date.
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Affected Aircraft
Fairchild-Hiller Model F-27 (F-27, F-27A, F-27B, F-27F, F-27G, F-27J, F-27M) airplanes, serial numbers 1 through 124 inclusive, with Cutler Hammer P/N 6046 H46 Relay in the flap control system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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