AD 67-30-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus SAS | BAC 1-11 200 Series | Airworthiness Directives; BRITISH AIRCRAFT Model BAC 1-11 200 Series Airplanes |
Unsafe Condition
Failure of the Thermal Relief Valve installed in the No. 2 Auxiliary Hydraulic Power System introduced by Modification PM 1653, and inadequate thermal relief device in all airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check No. 2 Auxiliary Hydraulic System Thermal Relief Valve for satisfactory functioning within 200 hours' time in service after the effective date, and at intervals not exceeding 200 hours. Conduct a bench test of Thermal Relief Valve P/N AIR 91186/2 within 600 hours' time in service after the effective date, and at intervals not exceeding 600 hours or when low maximum pressure is indicated. Replace defective parts with serviceable P/N AIR 91186/2 or modify the hydraulic system as specified. For Pre Modification PM 1653 airplanes, rework Lockheed Non-Return Valve to Choke Valve Assembly standard within 1,800 hours' time in service.
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Compliance Time
Within the next 200 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 200 hours' time in service from the last inspection (for paragraph (a)); within the next 600 hours' time in service after the effective date, and thereafter at intervals not to exceed 600 hours' time in service from the date of the last inspection or when a low maximum pressure is indicated (for paragraph (b)); within the next 1800 hours' time in service after the effective date (for paragraphs (d) and (e)).
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Affected Aircraft
BRITISH AIRCRAFT Model BAC 1-11 200 Series Airplanes, Post and Pre Modification PM 1653.
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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