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FAA
Federal Aviation Administration Department of Transportation
Aviation Safety
AIRWORTHINESS DIRECTIVE
Generated by Aircraft-logs.com — March 21, 2026

AD 48-05-01 ACTIVE

Oil Shutoff Valve 'O' Rings
Key Information
AD Number 48-05-01 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) DC3-G102 DC3-G102A DC3-G103A DC3-G202A DC3A-S1C3G DC3A-S1CG DC3A-S4C4G DC3A-SC3G DC3A-SCG DC3C-R-1830-90C DC3C-S1C3G DC3C-S4C4G DC3C-SC3G DC3D-R-1830-90C
Regulatory Text

48-05-01 DOUGLAS: Applies to All DC3 Aircraft Equipped With Pacific Aviation Oil Shutoff Valves. \n\n\tCompliance required at first engine change after March 1, 1948, but not later than May 1, 1948. \n\n\tReplace the present "O" rings in the oil shutoff valves with rings of H222-90 high temperature material or AMS-3228B material. There has been reported leakage attributed to the fact that the material in the "O" rings is not capable of withstanding the operating temperature of the oil. \n\n\t(Douglas Service Bulletin DC3 No. 256 covers this same subject.)

AD 48-05-01 — Oil Shutoff Valve 'O' Rings
Printed from Aircraft-logs.com — 03/21/2026