Airworthiness Directive · Amendment 39-14646 · Raytheon Model HS.125 Series 700A and 700B Airplanes; Model BAe.125 Series 800A (Including Variants C-29A and U-125), 800B, 1000A, and 1000B Airplanes; and Hawker 800 (Including Variant U-125A), 800XP, and 1000 Airplanes
Raytheon Model HS.125 Series 700A and 700B Airplanes; Model BAe.125 Series 800A (Including Variants C-29A and U-125), 800B, 1000A, and 1000B Airplanes; and Hawker 800 (Including Variant U-125A), 800XP, and 1000 Airplanes
This AD applies to the Raytheon airplanes identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in any category.
(1) Model HS.125 series 700A and 700B airplanes, on which Raytheon Modification 252885 has been incorporated or British Aerospace 125 Service Bulletin SB 24-239-2885 has been accomplished.
(2) All Model BAe.125 series 800A (including variants C-29A and U-125), 800B, 1000A, and 1000B airplanes.
(3) All Model Hawker 800 (including variant U-125A) and 1000 airplanes; and Model Hawker 800XP airplanes, serial numbers 1 through 258768 inclusive.
The FAA is adopting a new airworthiness directive (AD) for all Raytheon Model BAe.125 series 800A (including variants C-29A and U- 125), 800B, 1000A, and 1000B airplanes and Model Hawker 800 (including variant U-125A) and 1000 airplanes; and for certain Raytheon Model HS.125 series 700A and 700B airplanes and Model Hawker 800XP airplanes. This AD requires measuring the resistance of the current limiters for the PE, PS1, and PS2 busses, and replacing a current limiter with a new part if necessary. This AD also requires reporting certain information to the airplane manufacturer. This AD allows a records review for determining if suspect current limiters were installed, which may exempt airplanes from the required measurement. This AD results from reports that certain current limiters have opened within two to four hours after installation. We are issuing this AD to prevent loss of all primary electrical power, which could result in the airplane operating only under emergency power.
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 30 days or 25 flight hours after the effective date of this AD, whichever occurs first: Measure the resistance of the applicable current limiters, part number (P/N) UAM100, in accordance with paragraph 3.A.(2) of the Accomplishment Instructions of Raytheon Service Bulletin SB 24-3793, dated May 2006. The applicable current limiters are listed in Table 1 of the service bulletin. If the measured resistance of a current limiter is less than 0.46 milliohms or greater than 0.56 milliohms, before further flight, replace the part with a new part in accordance with the service bulletin. The new part must not be from picking tag purchase order (PO) 4501760749 or PO 4501743706 and must be the correct resistance in the range of 0.46 milliohms to 0.56 milliohms.
A review of airplane maintenance records is acceptable in lieu of the resistance measurement required by paragraph (f) of this AD, if the criteria in paragraph (g)(1) or (g)(2) of this AD can be determined conclusively from that review.
(1) The records review determines conclusively the date of the most recent 24-month “F” or “F7” inspection, as applicable, of current limiters and the date of the most recent replacement of current limiters, and that the inspection and replacement were not accomplished from February 1, 2006, through the effective date of this AD.
(2) The records review determines conclusively the picking tag PO of the current limiters, and that the current limiters are not from picking tag PO 4501760749 or PO 4501743706.
At the applicable time specified in paragraph (h)(1) or (h)(2) of this AD: Submit the Service Bulletin/Kit Drawing Report Fax (attached to Raytheon Service Bulletin SB 24-3793) to the Manager, Hawker Model Group, Raytheon Aircraft Company, Product Support Department (211), P.O. Box 85, Wichita, Kansas 67201-0085; fax (316) 676-3400. The report must include the results of the measurements required by paragraph (f) of this AD, the name(s) of the owner and operator of the airplane, the airplane registration number, the airplane serial number, and the number of landings and flight hours on the airplane. Under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection requirements contained in this AD and has assigned OMB Control Number 2120-0056.
(1) If the measurements were accomplished after the effective date of this AD: Submit the report within 10 days after the inspection.
(2) If the measurements were accomplished before the effective date of this AD: Submit the report within 10 days after the effective date of this AD.
(i) As of the effective date of this AD, no person may install a current limiter, P/N UAM100, on any airplane, unless the part meets one of the criteria specified in paragraphs (i)(1) and (i)(2) of this AD.
(1) The picking tag PO of the current limiter can be determined conclusively from a review of airplane maintenance records and shown not to be from picking tag PO 4501760749 or PO 4501743706.
(2) The resistance of the current limiter is measured and determined to be of the correct resistance in accordance with paragraph (f) 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.
