Airworthiness Directive · Amendment 39-11638 · British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes
British Aerospace Model BAe 146 and Avro 146-RJ Series Airplanes
All Model BAe 146 and Avro 146-RJ series airplanes, certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to all British Aerospace Model BAe 146 and Avro 146-RJ series airplanes, that requires a one-time inspection to detect cracking or corrosion of the forward attachment bolts of the engine pylon to wing interface, and corrective action, if necessary. It also requires re-installation with re-protected and sealed bolts torqued to a lower level. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to detect and correct cracking or corrosion of the forward attachment bolts of the engine pylon to wing interface, which could result in reduced structural integrity of the engine pylon attachment.
To detect and correct cracking or corrosion of the forward attachment bolts of the engine pylon to wing interface, which could result in reduced structural integrity of the engine pylon attachment, accomplish the following:
(a) Within 4 years since date of manufacture, or within 2,000 flight cycles after the effective date of this AD, whichever occurs later: Except as provided by paragraph (b) of this AD, perform applicable inspections (dye penetrant, magnetic particle, and detailed visual) to detect discrepancies (including damage, cracking, and corrosion) of the forward attachment bolts of the engine pylon to wing interface on each engine, in accordance with British Aerospace Service Bulletin SB.54-10, dated September 16, 1999. If any discrepancy is detected, prior to further flight, perform applicable corrective actions in accordance with the service bulletin.
Note 2: For the purposes of this AD, a detailed visual inspection is defined as: “An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.”
(b) Replacement of all bolts with new bolts in accordance with British Aerospace Service Bulletin SB.54-10, dated September 16, 1999, within the compliance time specified in paragraph (a) of this AD, is an acceptable alternative for compliance with the requirements of paragraph (a), provided all installation methods (including retorquing the bolts at a lower level, and applying sealant to the bolts) specified in the service bulletin are followed.
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.
Aircraft
