# AD 75-22-22: Compressed Gas Cylinders

- Type: Airworthiness directive
- Status: Current
- Products: Pressed Steel Tank Compressed Gas Cylinders
- Effective: November 10, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- Amendment: 39-2409
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6A72C21CCB69D6BC86256A33006DC3BF.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-22-22

## The airworthiness directive

75-22-22 PRESSED STEEL TANK COMPANY: Amendment 39-2409. Applies to all transport category airplanes incorporating DOT-3HT-3000 compressed gas cylinders manufactured by Pressed Steel Tank Company with original test dates on the cylinder from January 1975 through April 1975 and the following serial numbers:

50793R through 51284R 51913R through 52295R 52413R through 52648R 52663R through 52759R 10316S through 10468S 10516S through 10723S 11316S through 11415S

Compliance required within 30 days after the effective date of this Airworthiness Directive, unless already accomplished.

To identify and prevent service use of DOT-3HT-3000 cylinders which were manufactured with the wrong composition steel, accomplish the following:

  (a) Remove affected cylinders from aircraft, or before installing affected cylinders in aircraft, retest hydrostatically in accordance with Title 49 Code of Federal Regulations, Part 178; or

  (b) Use an equivalent method approved bythe Chief, Engineering and Manufacturing Branch, Great Lakes Region, to determine that the affected cylinder is manufactured with the intended composition steel.

The amendment becomes effective November 10, 1975.

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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