AD 2009-22-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2D15 (Regional Jet Series 705), and CL-600-2D24 (Regional Jet Series 900) Airplanes |
Unsafe Condition
A change in dimensions of the fuse blocks in the Auxiliary Power Unit (APU) Start Contactor Assembly (ASCA) box assembly can cause an incorrect interface between the bus bars and fuses. This condition can result in an increase in temperature, which could damage the ASCA box and/or compromise the availability of battery bus supply.
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Required Actions
Inspect the ASCA box to determine the part number. For ASCA boxes having part number BA670-53328-1 or BA670-53328-951, perform a detailed inspection of the fuse block date code. Before further flight, replace all fuse blocks with a date code between K23 (0323) through M08 (0508) inclusive. A review of airplane maintenance records is acceptable in lieu of the inspection to determine the part number.
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Compliance Time
Within 1,500 flight hours after the effective date of this AD
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Affected Aircraft
Bombardier Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), serial numbers 10112 through 10199 inclusive, and 10201 through 10206 inclusive; Bombardier Model CL-600-2D15 (Regional Jet Series 705) and CL-600-2D24 (Regional Jet Series 900), serial numbers 15007 through 15026 inclusive, 15030, and 15031.
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
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