Airworthiness Directive · Amendment 39-15704 · Boeing Model 747SP Series Airplanes
Boeing Model 747SP Series Airplanes
This AD applies to all Boeing Model 747SP series airplanes.
We are adopting a new airworthiness directive (AD) for all Boeing Model 747SP series airplanes. This AD requires repetitive lubrication of the rudder tab hinges and repetitive replacement of the rudder tab control rods. This AD results from reports of freeplay- induced vibration on the control surfaces on Boeing Model 727, 737, 757, and 767 airplanes. We are issuing this AD to prevent damage to the control surface structure during flight, which could result in loss of control of the airplane.
Comply with this AD within the compliance times specified, unless already done.
At the applicable compliance time listed in Paragraph 1.E., “Compliance,” of Boeing Special Attention Service Bulletin 747-27-2447, dated January 17, 2008, lubricate the rudder tab hinges and replace the rudder tab control rods with new control rods. Repeat the lubrication and replacement thereafter at the applicable repeat interval listed in paragraph 1.E., “Compliance,” of the service bulletin. Do all actions in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-27-2447, dated January 17, 2008. Where Boeing Special Attention Service Bulletin 747-27-2447, dated January 17, 2008, specifies a compliance time after the date on the service bulletin, this AD requires compliance within the specified compliance time after the effective date of this AD.
