Airworthiness Directive · Amendment 39-21242 · Integrated modular avionics
Airbus Helicopters Deutschland GmbH Helicopters
This AD applies to all Airbus Helicopters Deutschland GmbH Model MBB-BK 117 D-2 helicopters, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH Model MBB-BK 117 D-2 helicopters. This AD was prompted by a report of an erroneous low rotor revolutions per minute (RPM) indication after establishing a one engine inoperative (OEI) condition. This AD requires a software (SW) modification for the aircraft management computer (AMC). The FAA is issuing this AD to address the unsafe condition on these products.
(1) Affected part: An aircraft management computer (AMC) having a software (SW) version installed that is identified as “pre-modification SW” in Figure 1 to paragraphs (g)(1), (h), and (i) of this AD, or earlier SW version.
(2) Group 1: Helicopters that have an affected part installed.
(3) Group 2: Helicopters that do not have an affected part installed.
(1) For Group 1: Within 50 hours time-in-service after the effective date of this AD, update the SW of each affected part to the corresponding upgraded SW, as listed in Figure 1 to paragraphs (g)(1), (h), and (i) of this AD, in accordance with the Accomplishment Instructions, Section 3.B.2, of Airbus Helicopters Alert Service Bulletin MBB-BK117 D-2-42A-005, Revision 3, dated June 6, 2019.
(2) Replacement on a helicopter of an affected part with an AMC having the corresponding upgraded SW installed, as listed in Figure 1 to paragraphs (g)(1), (h), and (i) of this AD, or later SW upgrade is an acceptable alternative method of compliance for the requirements of paragraph (h)(1) of this AD for that helicopter.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
