59-20-04: Turbocompressor Engine Bleed Duct Assembly
FAA order 59-20-04 is an airworthiness directive. The FAA's subject line: Turbocompressor Engine Bleed Duct Assembly. It names Boeing 707: about 9 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- The Boeing Company
- Models
- 707-100 Long Body, 707-100B Long Body, 707-100B Short Body
- On this site
- Boeing 707 9 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 (1,238 characters)
59-20-04\tBOEING: Applies to the following 707-100 series aircraft only: Serial Numbers 17586 through 17591, 17609 through 17612, 17628 through 17652, 17658 through 17672, 17696 through 17702, 17925 through 17927. \n\tCompliance required not later than November 15, 1959. \n\tThere have been failures of the welded flanges located at each end of the turbocompressor bleed duct mounted on the high pressure bleed port of the engine. These failures have caused damage to the surrounding structure due to excessive pressure and temperature in the cowl and also required engine shutdown due to high EGT and low EPR. Therefore, the following modification(s) shall be accomplished as indicated: \n\t(a)\tAn additional filetweld shall be added to the external side of the three flanges on the turbocompressor engine bleed duct assembly. (Each pod utilizing a turbocompressor.) \n\t(b)\tThe existing boss weld on the turbocompressor engine bleed duct shall be strengthened by welding gussets to both the boss and duct. These gussets are to be fabricated in accordance with Boeing Service Bulletin No. 543 figure 2. \n\tNOTE: The above modification(s) are included in Boeing Airplane Company Service Bulletin No. 543 dated August 14, 1959.
Related safety bulletins advice on the same designs, not orders
2014-11-24NM-15-03 · Flight Controls
2014-11-06NM-15-02 · Cabin Equipment/Furnishings
2007-03-14NM-07-19 · Freeplay of the outboard aileron tabs
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/59-20-04.json · aircraft systems.