AD 77-13-13

77-13-13 BRITISH AIRCRAFT CORPORATION: Amendment 39-2938. Applies to BAC 1-11 200 and 400 series airplanes certificated in all categories.

Compliance is required as indicated.

To prevent possible failure of the whiffletree lever and subsequent loss of rudder feel capability, accomplish the following:

(a) Within 80 landings after the effective date of this AD, unless already accomplished, visually inspect the whiffletree lever, P/N CH504-009, in the rudder feel simulator unit, in accordance with the paragraphs designated 1. and 2. of paragraph 2.1.1 of British Aircraft Corporation Alert Service Bulletin 27-A-PM5407, Issue 1, dated April 9, 1976, (hereinafter referred to as BAC ASB) or an FAA-approved equivalent.

(b) If a defect appearing as a well-defined transverse groove, notch, or undercut in the radius of the lever is found during the inspection required by paragraph (a) of this AD, within the next 25 landings test and inspect the whiffletree lever for cracks in accordance with the paragraph designated as 3.(A) of paragraph 2.1.1. of the BAC ASB, or an FAA-approved equivalent, and -

(i) If a crack is found, before further flight, replace the defective lever with a new lever of the same part number, or an FAA-approved equivalent; or

(ii) If no crack is found, within the next 250 landings replace the whiffletree lever with a new lever of the same part number, or an FAA-approved equivalent.

If a replacement lever of the same part number is used it must be tested and inspected prior to installation in accordance with paragraph (a) of this AD and this paragraph and must be found free of the defects specified in this AD and cracks.

(c) For whiffletree levers used as replacements that were obtained from Lucas Aerospace, England as part of the Lucas repair kit for the whiffletree lever, and were installed in accordance with the kit installation instructions, Lucas Repair Scheme LRS 8114, at or before the next overhaul after installation modify the lever by replacing the bolts used in Lucas Repair Scheme LRS 8114 with rivets in accordance with the Lucas Overhaul Manual, as referred to in paragraphs 2.1.3 and 2.2 of the BAC ASB, or an FAA-approved equivalent.

(d) For the purpose of complying with this AD, subject to acceptance by the assigned FAA maintenance inspector, the number of landings may be determined by dividing each airplane's hours time in service by the operator's fleet average time from takeoff to landing for the airplane type.

This amendment becomes effective July 7, 1977.