52-26-01: Stabilizer Spar Web
FAA order 52-26-01 is an airworthiness directive. The FAA's subject line: Stabilizer Spar Web. System: airframe structure.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Sierra Hotel Aero, Inc.
- Models
- Navion (Army L-17A), Navion A (Army L-17B and L-17C), Navion B
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 (966 characters)
52-26-01\tNAVION: Applies to All Models, Serial Numbers NAV-4-2 and Subsequent. \n\nCompliance required as indicated. \n\nInspect as soon as practical, but not later than February 1, 1953, and at 100-hour intervals thereafter the area in the vicinity of the stabilizer fuselage attachment for cracks. Particular attention should be given to the stabilizer spar web (gusset) immediately outboard of the root rib and the fuselage attaching fitting. If cracks are found in the fuselage fitting, P/N 143-31004-13, the entire part should be replaced. Cracks in the root rib may be repaired in accordance with CAM No. 18. Cracks in the spar web (gusset) require the replacement of the gusset with a new part made in accordance with Figure 2. \n\n\n\nAD 52-26-01 \n\nPeriodic inspections of stabilizer spar web only may be discontinued after installation of new gussets. \n\n(Ryan Navion Field Service Bulletin No. 17 dated September 28, 1952, covers this same subject.)
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/52-26-01.json · aircraft systems.