AD 67-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Schweizer Aircraft Corporation | 269A | Airworthiness Directives; Hughes Model 269 Series Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269A-1 | Airworthiness Directives; Hughes Model 269 Series Helicopters |
| aircraft | Schweizer Aircraft Corporation | 269B | Airworthiness Directives; Hughes Model 269 Series Helicopters |
Unsafe Condition
Concentration of carbon monoxide gas in the cabin in excess of the amounts allowable under applicable airworthiness rules due to improper positioning of the upper and lower air vents on the left and right hand door panels and inadequate sealing of the cabin.
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Required Actions
Install air scoop, restrict positioning of the upper and lower air vents on the left and right hand door panels to face forward and upward, and seal cabin in accordance with Hughes Service Information Notice No. N-33 dated May 12, 1967, or later approved revision or by a method approved by the Aircraft Engineering Division, FAA Western Region, Los Angeles, California.
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Compliance Time
within the next 25 hours' time in service following the effective date of this AD unless already accomplished
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Affected Aircraft
Schweizer Aircraft Corporation Model 269A, 269A-1, 269B helicopters
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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