47-27-02: Spar Web Structure
FAA order 47-27-02 is an airworthiness directive. The FAA's subject line: Spar Web Structure. It names Douglas C-54: about 7 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: airframe structure.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- The Boeing Company
- Models
- C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, DC-4
- On this site
- Douglas C-54 7 registered
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (995 characters)
47-27-02 DOUGLAS: (Was Service Note 4 of AD-762-7.) Applies to All C-54-DC Series and DC-4 Airplanes. \n\n\tInspection required at intervals not to exceed 170 hours. \n\n\tOpen the quick-opening type inspection doors in the bottom of the outer wing and center wing section surfaces forward of the front spar and aft of the center spar. Inspect spar web structure for loose rivets, cracks, or other irregularities. Pay particular attention in the fuel tank areas for evidence of fuel leaks which will indicate cracked spar webs or rivets and seam leaks. \n\n\tAll spar web cracks which are found after accomplishment of AD 46-27-01 (Service Bulletin C-54-205. "Rework - Integral Fuel Tanks") or cracks that are located in areas to which the Service Bulletin C-54-205 does not apply, should be repaired in accordance with Douglas Drawing No. 5354811, "Service Rework-Station 463, Outer Wing, Center Spar", and No. 3344236, "Repair-Integral Tank Spar Web Crack". \n\n\tRevised March 21, 1961.
Related safety bulletins advice on the same designs, not orders
2014-11-24NM-15-03 · Flight Controls
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/47-27-02.json · aircraft systems.