AD 91-13-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-21 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-31 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-32 | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
| aircraft | The Boeing Company | DC-9-32 (VC-9C) | Airworthiness Directives; McDONNELL DOUGLAS DC-9 Series, DC-9-80 Series, C-9 (Military), and MD-88 Airplanes |
Unsafe Condition
Loss of generator electrical power due to potential rapid cycling of the AC cross-tie relay, manifested by buzzing/chattering sounds, circuit breaker trips, aural warnings, instrument loss, or annunciator flashes.
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Required Actions
Within 30 days after February 15, 1990, add specified limitations to the AFM. Within 2 years after July 15, 1991, replace Westinghouse BCU Part Number 947F946-2 with Part Number 947F946-3 per SB 24-119. Allow alternate compliance with FAA approval.
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Compliance Time
Within 30 days after February 15, 1990 and within 2 years after July 15, 1991
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Affected Aircraft
McDonnell Douglas DC-9 series, DC-9-80 series, C-9 (Military), and MD-88 airplanes equipped with Westinghouse BCU Part Number 947F946-2.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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