AD 73-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/R-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A/S-522 | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/R | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 3A/RA | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 400A | Airworthiness Directives; HAWKER SIDDELEY AVIATION, LTD. Model BH-125 and DH-125 Airplanes |
Unsafe Condition
Overhauled oxygen cylinders with stamp impressions on critical areas of the cylinder shoulder may experience burst failure due to local distortion in the hemispherical profile.
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Required Actions
Visually inspect oxygen cylinders for stamp impressions. Replace cylinders with serviceable parts or FAA-approved equivalents if stamp impressions are on the cylinder shoulder outboard of a 3-inch radius from the center or inboard with local distortion. Limit oxygen system charge to 50% and install a placard if recharging before inspection.
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Compliance Time
within the next 14 days after the effective date of this AD, except as provided in paragraph (c), and thereafter at each replacement of an oxygen cylinder with an overhauled oxygen cylinder
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Affected Aircraft
Hawker Siddeley Model BH-125 and DH-125 airplanes equipped with overhauled oxygen cylinders (P/N WKA 29396/GR14, WKA 29396/GR22, WKA 31393, and WKA 31394)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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