AD 2020-15-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | Helicopters Model EC 155B and EC155B1 | Airworthiness Directives; Airbus Helicopters |
Unsafe Condition
Incorrect wiring of an attitude and heading reference system (AHRS) could result in the display of misleading attitude and vertical speed information, and subsequent loss of control of the helicopter in instrument meteorological conditions (IMC).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Before further flight in IMC or within 660 hours time-in-service, whichever occurs first, modify the wiring of connector 11 ALPHA as depicted in Figure 1 of Airbus Helicopters Alert Service Bulletin (ASB) No. EC155-34A033, Revision 2, dated January 30, 2018 (ASB EC155-34A033) for helicopters with wiring change modification (MOD) 0722B51 installed, and also modify the wiring to connector 11 ALPHA as depicted in Figure 2 of ASB EC155-34A033 if a combined voice and flight data recording system (MOD 0731B89) is installed. For helicopters without wiring change MOD 0722B51 installed, modify the wiring of connector 11 ALPHA as depicted in Figure 1 and Figure 2 of Airbus Helicopters ASB No. EC155-34A037, Revision 0, dated February 19, 2018.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight in IMC or within 660 hours time-in-service, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Airbus Helicopters Model EC 155B and EC155B1 helicopters, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.