AD 79-10-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | CL-44D4 | Airworthiness Directives; CANADAIR Models CL-44D4, and CL-44J Aircraft |
| aircraft | Bombardier Inc. | CL-44J | Airworthiness Directives; CANADAIR Models CL-44D4, and CL-44J Aircraft |
Unsafe Condition
The engine fire extinguishing system fittings in inboard and outboard nacelles may not be adequately fireproofed, increasing the risk of fire. Over-pressurization of outer auxiliary fuel tanks during pressure refueling and interference between float arm and valve casing may cause wear and fuel system malfunctions. Engine oil and fuel drain lines in engine bottom cowls may be damaged, increasing the risk of flammable fluid fires.
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Required Actions
Wrap engine fire extinguishing system fittings with asbestos tape and coat with a suitable end dip per Canadair Service Bulletin No. CL-44D4-480. Alter modulator and shut-off pilot valves by riveting a fabricated angle to the float, re-identify valves, and functionally check them per Canadair Service Bulletin No. CL-44-485. Alter engine cowling and drain lines per Canadair Service Bulletin No. CL-33D4-486 or equivalent approved method.
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Compliance Time
within the next 1700 hours in service and, if applicable, upon application for U.S. registration and airworthiness certification after the effective date of this AD unless already accomplished
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Affected Aircraft
Bombardier Inc. Models CL-44D4 and CL-44J aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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