AD 69-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maryland Air Industries, Inc. | F-27 | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27A | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27B | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27F | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27G | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27J | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | F-27M | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227 | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227B | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
| aircraft | Maryland Air Industries, Inc. | FH-227C | Airworthiness Directives; Fairchild-Hiller Model F-27 and FH-227 Airplanes |
Unsafe Condition
Failure of the flap drive system's universal joints could result in flaps driving off the ends of the screw jacks, leading to hazards associated with the loss of flap control limit switches and emergency power cutoff switches functionality.
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Required Actions
Inspect universal joints on flap connecting shaft assembly P/N 27-727994-11 and actuator shaft P/N 27-727920-7/-9/-13 for freedom of movement in all axes. Replace deficient universal joint pins or bolts before further flight if movement is not determinable. Lubricate the three universal joints per maintenance manual instructions. Additionally, separate flap limit switches from emergency power cutoff switches by complying with specified service bulletins within 1000 hours.
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Compliance Time
Within the next 100 hours' in service after the effective date, unless already accomplished within the last 25 hours in service, and thereafter at intervals not to exceed 125 hours' in service, until incorporation of the modification noted in (b). For the modification in (b), within the next 1000 hours' in service after the effective date, unless already accomplished.
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Affected Aircraft
Fairchild-Hiller Model F-27 (all variants except FH-227D and FH-227E) and FH-227 airplanes except FH-227D and FH-227E, certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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