Airworthiness Directive · Amendment 39-15969 · Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes
Boeing Model 707 Airplanes and Model 720 and 720B Series Airplanes
This AD applies to all Boeing Model 707-100 long body, -200, -100B long body, and -100B short body series airplanes; Model 707-300, -300B, -300C, and -400 series airplanes; and Model 720 and 720B series airplanes; certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 707 airplanes and Model 720 and 720B series airplanes. This AD requires performing an operational test of the engine fuel suction feed of the fuel system, and other related testing and corrective actions if necessary. This AD results from a report of in- service occurrences of loss of fuel system suction feed capability, followed by total loss of pressure of the fuel feed system. We are issuing this AD to detect and correct failure of the engine fuel suction feed capability of the fuel system, which could result in multi-engine flameout, inability to restart the engines, and consequent forced landing of the airplane.
Comply with this AD within the compliance times specified, unless already done.
Within 18 months after the effective date of this AD: Perform an operational test of the engine fuel suction feed of the fuel system, and perform all other related testing and corrective actions, as applicable, before further flight, in accordance with the Accomplishment Instructions of Boeing 707 Service Bulletin A3527, Revision 1, dated August 6, 2008. Repeat the operational test thereafter at intervals not to exceed 6,000 flight hours or 36 months, whichever occurs first.
Actions done before the effective date of this AD in accordance with Boeing Alert 707 Service Bulletin A3527, dated November 7, 2007, are acceptable for compliance with the initial test and related testing and corrective actions required by paragraph (f) of this AD.
