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FAA
Federal Aviation Administration Department of Transportation
Aviation Safety
AIRWORTHINESS DIRECTIVE
Generated by Aircraft-logs.com — March 24, 2026

AD 53-19-01 ACTIVE

Generator Cooling Fan
Key Information
AD Number 53-19-01 Status Active
Effective Date Not specified Issue Date Not specified
Docket Number Unknown Amendment N/A
Product Type ["Aircraft"] Product Subtype ["Large Airplane"]
CFR Part --- - Part 39 CFR Section N/A
Citation This information is not available.
Applicability
Manufacturer(s) The Boeing Company
Model(s) C54-DC DC-4
Regulatory Text

53-19-01 DOUGLAS: Applies to All DC-4 and C54-DC Series Aircraft Utilizing Eclipse-Pioneer Type 901 Generators. \n\n\tTo be accomplished by the next engine overhaul, but not later than April 1, 1954. \n\n\tIn view of the fire hazard existing in the use of the magnesium cooling fan in the Eclipse Type 901 generator in the DC-4 and C-54 Series aircraft installations, the magnesium fan as a unit must be removed and Eclipse-Pioneer spacer P/N 866570 installed in its place. \n\n\t(Eclipse-Pioneer Service Bulletin No. 505 covers the above subject.)

AD 53-19-01 — Generator Cooling Fan
Printed from Aircraft-logs.com — 03/24/2026