AD 89-18-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | BAe.125 Series 1000A | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BAe.125 Series 1000B | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BAe.125 Series 800A | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BAe.125 Series 800A (C-29A) | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BAe.125 Series 800A (U-125) | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BAe.125 Series 800B | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BH.125 Series 400A | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | BH.125 Series 600A | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
| aircraft | Textron Aviation Inc. | DH.125 Series 1A-522 | Airworthiness Directives; BRITISH AEROSPACE Model DH/HS/BH/BAe 125 Series Airplanes |
Unsafe Condition
An uncontained APU rotor failure could cause a fire in the aft equipment compartment, puncture of the aft pressure bulkhead, and severance of the control cables.
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Required Actions
Revise the AFM Supplement Limitations Section to prohibit APU operation during flight except during an emergency. Install a placard next to the APU start switch with the same prohibition statement. An alternate means of compliance may be approved by the Manager, Standardization Branch, ANM-113, FAA.
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Compliance Time
Within the next 10 days after the effective date of this AD
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Affected Aircraft
BRITISH AEROSPACE Model DH/HS/BH/BAe 125 series airplanes equipped with Sundstrand Turbomach Titan APU Model T-62T Series in the aft equipment compartment, including installations under specified STCs.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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