AD 48-17-01

48-17-01 DOUGLAS: Applies to All DC3 Series Aircraft As Specified by Civil Air Regulations Amendment 41-3, 41-18, 42-2, 42-8, 61-2, and 61-16.

To be accomplished not later than the dates specified in the above amendments and any subsequent regulations effecting these compliance dates.

All air carrier aircraft must be modified to comply with the fire prevention requirements as outlined in CAR Amendments 41-3, 41-18, 42-2, 42-8, 61-2, and 61-16. The modification outlined in the following listed Douglas Service Bulletins are required for compliance with these amendments. Other modifications shown to be equivalent to those covered by the Service Bulletins will also be acceptable.

DC3 No. 250, "Installation of Fire Detector in Engine Accessory Section and Smoke Detector in Aft Cargo Compartment"; DC3 No. 252, "Rear Baggage Compartment Access Door and Vent"; DC3 No. 258, "Elimination of Holes in Firewall, Addition of Control Cable Seals, Replacement of Dural Plates and Fittings With Steel Plates and Fittings. Replacement of Fluid Carrying Lines Forward of Firewall With Steel or Fire Resistant Flexible Hoses'; DC3 No. 259, "Installation of Shut-Off Valves on Lines Carrying Combustible Fluids Into the Engine Accessory Section". (Installation of additional fuel valves listed on Page 2 of this Bulletin is recommended but is not mandatory.)

NOTE: It will be noted that Service Bulletins DC3 No. 258 and No. 259 apply to all DC3C and DC3D (C-47 and C-117) Series airplanes only with P&W R-1803 engines. Since there are various differences in early DC3 powerplant installations with P&W S1C3-G engines and Wright GR-1820 engines, it will be the operator's responsibility to use these two Bulletins as a guide and develop the fire prevention items for other DC3 Series airplanes accordingly.

In addition to the above, it will be necessary to ascertain that all interior materials and finishes comply with applicable sections of CAR 4b. Safety Regulation Release 259 outlines acceptable procedures for complying with these particular requirements.