Airworthiness Directive · Amendment 39-15686 · Boeing Model 737-600, -700, -700C, -800, and -900 Series Airplanes Equipped With CFM56-7 Engines
Boeing Model 737-600, -700, -700C, -800, and -900 Series Airplanes Equipped With CFM56-7 Engines
This AD applies to Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 737-54-1045, dated July 25, 2007.
The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 737-600, -700, and -800 series airplanes. That AD currently requires repetitive inspections to detect damage of the aft strut insulation blanket, and eventual replacement of the insulation blankets with new, improved blankets. This new AD adds airplanes to the applicability and requires installation of a new heat insulation blanket and new cover plate on the left and right side engine struts. This new AD does not retain the requirements of the existing AD but does terminate the requirements of the existing AD. This AD results from reports of damaged heat insulation blankets on the engine struts. We are issuing this AD to prevent exposure of the lower surface of the strut to extreme high temperatures, consequent creation of a source of fuel ignition, and increased risk of an uncontrollable fire and possible fuel tank explosion.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 60 months after the effective date of this AD, install a new heat insulation blanket, part number (P/N) S315A213-57, and a new cover plate on the left and right side engine struts in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 737-54-1045, dated July 25, 2007, except Figure 2 and Figure 4 of the service bulletin should show four holes on the aft edge of the heat insulation blanket instead of two. Operators should also note that on installation of the heat insulation blanket, the two inner holes on the aft edge of the heat insulation blanket are not used or filled.
As of the effective date of this AD, no person may install a heat insulation blanket, P/N S315A213-42 or -47, on any airplane.
