AD 96-08-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105A | Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model BO-105, BO-105A, BO-105C, BO-105S, and BO-105LS A-1 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105C | Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model BO-105, BO-105A, BO-105C, BO-105S, and BO-105LS A-1 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105LS A-1 | Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model BO-105, BO-105A, BO-105C, BO-105S, and BO-105LS A-1 Helicopters |
| aircraft | Airbus Helicopters Deutschland GmbH | BO-105S | Airworthiness Directives; Eurocopter Deutschland GmbH (ECD) Model BO-105, BO-105A, BO-105C, BO-105S, and BO-105LS A-1 Helicopters |
Unsafe Condition
Component wear in the tandem hydraulic switch-over system could result in a sudden drop in the collective and a sudden loss of altitude.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a ground test of the tandem hydraulic system and inspect the switch-over system linkage for wear. If switch-over reactions occur, perform additional inspections and required maintenance procedures as specified in the service bulletin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 1 year.
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Affected Aircraft
Eurocopter Deutschland GmbH (ECD) Model BO-105, BO-105A, BO-105C, BO-105S, and BO-105LS A-1 helicopters with tandem hydraulic unit part numbers 105-45021, 105-45023, or 105-45028, and valve body manifolds D133-756, D133-756E, ZE1-126-I, ZE2-126, or ZE2-126-1 installed on either Hydraulic System 1 or 2.
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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