AD 97-21-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BAe.125 Series 800A | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | BAe.125 Series 800A (C-29A) | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | BAe.125 Series 800A (U-125) | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | BH.125 Series 400A | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | DH.125 Series 400A | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | Hawker 800 | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | Hawker 800 (U-125A) | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | Hawker 800XP | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
| aircraft | Textron Aviation Inc. | HS.125 Series 600A | Airworthiness Directives; Raytheon Model DH.125-400A; BH.125-400A and -600A; HS.125-600A and -700A; BAe 125-800A Series Airplanes; and Hawker 800 and Hawker 800 XP Series Airplanes Including Military Variants |
Unsafe Condition
High pressure oxygen hose assemblies with part number WKA 34609 are susceptible to leakage due to not meeting design specifications during manufacturing, which could result in insufficient oxygen available to passengers or crew if cabin pressure altitude requires emergency oxygen.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 90 days after the effective date, perform a one-time inspection to determine if high pressure oxygen hose assemblies with discrepant part number WKA 34609 are installed. If found, replace them with part number 58179-101 prior to further flight. Do not install WKA 34609 hoses after the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 90 days after the effective date of this AD, and prior to further flight if discrepant hoses are found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Raytheon Model DH.125-400A, BH.125-400A and -600A, HS.125-600A and -700A, BAe 125-800A series; Hawker 800 and Hawker 800 XP series (including military variants C29A, U125, U125A) with serial numbers 1 through 258294 inclusive, where Modification 252036 is installed with part number WKA 34609.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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