Airworthiness Directives; Rolls-Royce plc RB211 Series Turbofan Engines
The FAA proposes to supersede an existing airworthiness directive (AD) for Rolls-Royce plc (RR) RB211-22B series, RB211-524B, - 524C2, -524D4, -524G2, -524G3, and -524H series, and RB211-535C and - 535E series turbofan engines with high pressure compressor (HPC) stage 3 disc assemblies, part numbers (P/Ns) LK46210, LK58278, LK67634, LK76036, UL11706, UL15358, UL22577, UL22578, and UL24738 installed. That AD requires removing from service certain disc assemblies before they reach their full life if not modified with anticorrosion protection. This proposed AD would require the same actions as AD 2004- 01-20, but would shorten the compliance time for disks that entered service before 1990. This proposed AD results from the manufacturer's reassessment of the corrosion risk on HPC stage 3 disc assemblies not modified with sufficient application of anticorrosion protection. We are issuing this AD to prevent corrosion-induced uncontained disc failure, resulting in damage to the airplane.
Airworthiness Directives; Boeing Model 757-200, -200PF, and -200CB Series Airplanes Equipped With Pratt & Whitney or Rolls-Royce Engines
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 757-200, -200PF, and -200CB series airplanes. This AD requires inspecting to determine the part number of the upper link forward fuse pins of the engine struts and replacing the fuse pins as necessary. This AD is prompted by a report indicating that, due to an incorrect listing in the illustrated parts catalog, persons performing maintenance on the engine strut(s) could have installed an incorrect upper link forward fuse pin. We are issuing this AD to prevent a ruptured wing box, due to the engine not separating safely during certain emergency landing conditions, which could lead to a fuel spill and consequent fire.
Airworthiness Directives; McDonnell Douglas Model DC-8-11, DC-8-12, DC-8-21, DC-8-31, DC-8-32, DC-8-33, DC-8-41, DC-8-42, DC-8-43, DC-8F-54, and DC-8F-55 Airplanes; and DC-8-50, DC-8-60, DC-8-60F, DC-8-70, and DC-8-70F Series Airplanes
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas airplane models. This AD requires a one-time test to determine the material of the upper inboard spar cap of the wing, and corrective actions if necessary. This action is necessary to prevent stress corrosion cracking in the forward tang of the upper inboard spar cap of the wing, which could result in structural damage to adjacent components of the wing and consequent reduced structural integrity of the airplane. This action is intended to address the identified unsafe condition.