Airworthiness Directive · Amendment 39-14443 · Raytheon Model DH.125, HS.125, and BH.125 Series Airplanes; Model BAe.125 Series 800A (C-29A and U-125), 800B, 1000A, and 1000B Airplanes; and Model Hawker 800 (including variant U-125A), and 1000 Airplanes
Raytheon Model DH.125, HS.125, and BH.125 Series Airplanes; Model BAe.125 Series 800A (C-29A and U-125), 800B, 1000A, and 1000B Airplanes; and Model Hawker 800 (including variant U-125A), and 1000 Airplanes
This AD applies to Raytheon Model DH.125, HS.125, and BH.125 series airplanes; Model BAe.125 Series 800A (C-29A and U-125), 800B, 1000A, and 1000B airplanes; and Model Hawker 800 (including variant U-125A), and 1000 airplanes, certificated in any category; as identified in Raytheon Service Bulletin SB 21-3669, dated December 2004.
The FAA is superseding an existing airworthiness directive (AD), which applies to certain Raytheon airplanes identified above. That AD currently requires a visual inspection to determine whether adequate clearance exists between the fan venturi motor casing and the adjacent equipment, and adjustments, if necessary; and a visual inspection to detect signs of overheating, degradation of insulating materials, and ingestion of debris into the motor, and replacement of discrepant parts with serviceable parts. This new AD instead requires that operators replace the fan venturi with a new or modified part. This AD results from reports that the fan venturi overheated and produced smoke while the airplane was on the ground. We are issuing this AD to prevent heat and fire damage to equipment adjacent to the fan venturi, which could result in smoke in the cabin and/or burning equipment.
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 1,200 flight hours or 24 months after the effective date of this AD, whichever occurs first, do the action in either paragraph (f)(1) or (f)(2) of this AD in accordance with the Accomplishment Instructions of Raytheon Service Bulletin SB 21-3669, dated December 2004.
(1) Modify the existing fan venturi part number (P/N) 132322-2-1 by installing an improved motor, P/N 207640-34.
(2) Replace the existing fan venturi P/N 132322-2-1 with a new fan venturi P/N 132322-3-1.
Note 1: Raytheon Service Bulletin SB 21-3669 refers to Honeywell Service Bulletin 132322-21-4041, Revision 2, dated August 20, 2004, as an additional source of service information for doing the modification. The Raytheon service bulletin includes the Honeywell service bulletin.
As of the effective date of this AD, no person may install a fan venturi, P/N 132322-2-1, on any airplane unless the fan venturi has been modified in accordance with paragraph (f)(1) of this AD; or unless the fan venturi has a new P/N in accordance with paragraph (f)(2) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
