86-25-01 COLLINS AVIONICS DIVISION/ROCKWELL INTERNATIONAL: Amendment 39-5502. Applies to Model 51RV-4 VOR-ILS Navigation Receivers, Part Number 622-3255-XXX, Serial Number 5960 thru and including 7277, certificated to the applicable requirements of Technical Standard Orders C34c, C36c and C40a.
Compliance: Required as indicated in the body of this AD unless already accomplished.
To prevent deviation output signal oscillation that may cause undetected erroneous VOR and ILS localizer deviation display, flight director commands, and/or autopilot tracking, accomplish the following:
(a) For Model 51RV-4 navigation receivers not installed in an aircraft, prior to further use, modify the unit in accordance with the instructions contained in Collins Alert Service Bulletin A22 dated November 25, 1986.
(b) For Model 51RV-4 navigation receivers installed in an aircraft, accomplish the following:
(1) For installations approved for Category II, III, and/or autoland operations; within three calendar days after the effective date of this AD, fabricate and install on the instrument panel adjacent to the receiver control head and visible to the pilots the following placard using letters of a minimum 0.10 inch in height: "CATEGORY II/III/AUTOLAND: (as appropriate) "OPERATIONS PROHIBITED." and operate the aircraft accordingly. The placard required by this paragraph may be installed by the holder of a pilot certificate issued by the FAA and valid for the aircraft in which the equipment is installed.
(2) Within three calendar days after the effective date of this AD, fabricate and install on the instrument panel adjacent to the receiver control head and visible to the pilots the following placard using letters of a minimum 0.10 inch in height: "AP/FD NOT TO BE COUPLED TO VOR/LOC." and operate the aircraft accordingly. The placard required by this paragraph may be installed by the holder of a pilot certificate issued by the FAA and valid for the aircraft in which the equipment is installed.
(3) Within three calendar days after the effective date of this AD, unless already verified within the preceding two calendar days prior to the effective date of this AD; verify localizer centering using a calibrated reference signal or operational ILS localizer signal. This test may be accomplished by alignment of the aircraft on the centerline of a runway served by an ILS signal and observing the HSI (CDI) centering is within two needlewidths of center. Verify VOR centering by using a calibrated reference signal or approved VOR test location (VOT) and observing the HSI (CDI) centering is within plus/minus 2 1/2 degrees. These tests must be accomplished with the receiver installed in the aircraft in its normal configuration. If either test produces unsatisfactory results, the navigation receiver must be removed from service. These tests may be accomplished by the holder of a pilot certificate issued by the FAA and valid for the aircraft in which the equipment is installed.
(4) Within 30 calendar days after the effective date of this AD, modify the effected receiver in accordance with the instructions contained in Collins Alert Service Bulletin A22 dated November 25, 1986, or replace with a serviceable unit.
(5) Upon modification of the navigation receiver in accordance with the instructions contained in Collins Alert Service Bulletin A22 dated November 25, 1986, the requirements of paragraphs (b)(1), (b)(2), and (b)(3) of this AD no longer apply.
(c) Aircraft may be flown in accordance with Federal Aviation Regulation 21.197 under visual meteorological conditions to a location where this AD can be accomplished.
(d) An equivalent means of compliance with this AD may be used if approved by the Manager, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209.
All persons affected by this directive may obtain copies of the documents referred to herein upon request to Collins Avionics Division, 400 Collins Road NE, Cedar Rapids, Iowa 52498; or FAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.
This amendment becomes effective on January 6, 1987, to all persons except those to whom it has already been made effective by priority letter from the FAA dated December 5, 1986, and is identified as AD 86-25-01.