AD 75-22-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pressed Steel Tank Company | Compressed Gas Cylinders | Airworthiness Directives; PRESSED STEEL TANK COMPANY: Applies to all Transport Category Airplanes Incorporating DOT-3HT-3000 Compressed Gas Cylinders |
Unsafe Condition
DOT-3HT-3000 compressed gas cylinders manufactured with the wrong composition steel between January and April 1975 could fail due to material defects.
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Required Actions
Remove affected cylinders from aircraft or hydrostatically retest them in accordance with 49 CFR Part 178. Alternatively, use an equivalent method approved by the Chief, Engineering and Manufacturing Branch, Great Lakes Region, to verify the correct steel composition.
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Compliance Time
within 30 days after the effective date of this Airworthiness Directive, unless already accomplished
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Affected Aircraft
Pressed Steel Tank Company DOT-3HT-3000 compressed gas cylinders installed on all transport category airplanes, with original test dates from January 1975 through April 1975 and serial numbers 50793R through 51284R, 51913R through 52295R, 52413R through 52648R, 52663R through 52759R, 10316S through 10468S, 10516S through 10723S, or 11316S through 11415S.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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