89-26-09 BRITISH AEROSPACE: Amendment 39-6420. Docket No. 88-NM-169-AD.
Applicability: British Aerospace (BAe) Model 146-100A, -200A and -300A series airplanes, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent loss of roll control should a jam in aileron control system occur, accomplish the following:
A. Within 60 days after the effective date of this AD:
1. Determine if Fraser Nash Part Number AO-100-902 aileron disconnect units (ADU's) or Normalair-Garrett, Ltd. (NGL) Part Numbers 1099R000, 1224R000, or 1295R000 ADU's are installed. If NGL Part Number 1295R000 ADU's modified to British Aerospace (BAe) Modification HCM70212C (NGL Modification No. 5RM) configuration are installed, no further action is required.
2. Modify NGL Part Number 1295R000 ADU's to BAe modification HCM70212C (NGL modification 5RM) configuration, in accordance with BAe Modification Service Bulletin 27-88-70212C, dated November 10, 1988.
3. Inspect Fraser Nash Part Number AO-100-902 and NGL Part Numbers 1099R000 and 1224R000 ADU's for dormant failure, in accordance with British Aerospace Inspection Service Bulletin 27-87, dated September 30, 1988. Replace any failed units with serviceable units prior to further flight.
B. For all airplanes equipped with NGL Part Numbers 1099R000 and 1224R000 ADU's that have not been previously modified to BAe HCM 70212A&B (NGL Modification 3RM and 4RM) configuration:
1. Within one year after the effective date of this AD, modify NGL Part Number 1099R000 and 1224R000 ADU's to BAe HCM70212A&B (NGL Modification 3RM and 4RM) and BAe HCM70212C (NGL Modification 5RM) configuration, in accordance with BAe Modification Service Bulletins 27-75-70212A&B, dated June 16, 1988, and 27-88-70212C, dated November 10, 1988.
NOTE: British Aerospace Modification Service Bulletin 27-75-70212A&B refers to NGL Service Bulletins 1099R-27-4 and 1224R-27-5. British Aerospace Modification Service Bulletin 27-88-70212C refers to NGL Service Bulletin 1295R-27-6, Revision 1, and NGL Service News Letter, dated September 12, 1988, for specific installation procedures.
C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.
NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Standardization Branch, ANM-113.
D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.
All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to British Aerospace, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.
This amendment (39-6420, AD 89-26-09) becomes effective on January 14, 1990.