Airworthiness directives › 2021-05-07
AD 2021-05-07 Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH) Helicopters
Models named: BO-105A, BO-105C, BO-105S, MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, MBB-BK 117 C-1. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the following Airbus Helicopters Deutschland GmbH (Type Certificate previously held by Eurocopter Deutschland GmbH) helicopters, certificated in any category: (1) Model BO-105A, BO-105C, and BO-105S helicopters with a voltage regulator part number (P/N) 51565-000, 51565-000R, or 51509-002R installed; and (2) Model MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, and MBB-BK 117 C-1 helicopters.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 50 hours time-in-service (TIS): (i) Visually inspect the wire terminal of wire P55F16N/P56F16N for Model BO-105A, BO-105C, and BO-105S helicopters and wire 1PA53B20/2PA53B20 for Model MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, and MBB-BK 117 C-1 helicopters on Terminal E of each starter-generator for a crack, a kink, fraying, looseness, missing material, and corrosion. If there is a crack, a kink, fraying, looseness, missing material, or any corrosion, before further flight, replace the wire terminal. (ii) Measure the resistance between each starter-generator and its regulator in accordance with the Accomplishment Instructions, paragraph 2.A.2.3. of Eurocopter Alert Service Bulletin ASB BO105-90-103, Revision 4, dated June 21, 2010, or paragraphs 2.A.2.3. and 2.A.2.5. of Eurocopter Alert Service Bulletin ASB-MBB-BK117-90-118, Revision 2, dated May 4, 2009, as applicable to your model helicopter. If the resistance is more than 500 milliohms, before further flight, replace the wire terminal. (2) Within 150 hours TIS: (i) Install a wire harness from each generator voltage regulator as follows. (A) For Model BO-105A, BO-105C, and BO-105S helicopters: Wire harness P/N 105-90081. (B) For Model MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, and MBB-BK 117 B-2 helicopters: Wire harness P/N 117-901941. (C) For Model MBB-BK 117 C-1 helicopters: Wire harness P/N 117-901961. (ii) For Model MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, and MBB-BK 117 C-1 helicopters, revise the existing Rotorcraft Flight Manual (RFM) for your helicopter to include the information in Section 3 Emergency and Malfunction Procedures of the following temporary revisions, as applicable to your helicopter: Eurocopter Flight Manual BK117 A-3 Temporary Revision 9, Eurocopter Flight Manual BK117 A-4 Temporary Revision 5, Eurocopter Flight Manual BK117 B-1 Temporary Revision 6, Eurocopter Flight Manual BK 117 B-2 Temporary Revision 1, or Eurocopter Flight Manual BK 117 C-1 Temporary Revision 2, all dated September 22, 2006. Using a later RFM revision with information identical to that contained in the temporary revision specified for your helicopter is acceptable for compliance with the requirement of this paragraph. (iii) For Model MBB-BK 117 A-1 helicopters, revise Section 3 Emergency and Malfunction Procedures of the existing RFM for your helicopter to include the information in Figures 1 through 3 to paragraph (g)(2)(iii) of this AD. BILLING CODE 4910-13-P ER12MR21.007 ER12MR21.008 ER12MR21.009 ER12MR21.010 BILLING CODE 4910-13-C
Unsafe condition
This AD was prompted by a report of a loss of electrical ground between the starter- generator and the generator voltage regulator (regulator). The FAA is issuing this AD to address loss of electrical ground between the starter-generator and the regulator. This condition could result in an overvoltage of electrical power, damage to electronic equipment, and subsequent loss of control of the helicopter.
Affected ADs
None.
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