AD 75-13-03

75-13-03 MCDONNELL DOUGLAS: Amendment 39-2240. Applies to all Douglas Model DC-10-10, -10F, -30, -30F, and -40 series airplanes, certificated in all categories.

To insure positive engagement of the passenger door downlock, accomplish the following on all passenger doors except the Type I (most forward left and right) doors on fuselage numbers one through 92.

Compliance required as indicated.

Unless already accomplished, within the next 48 hours (elapsed time) after the effective date of this AD on Douglas fuselage numbers one through 104, and within the next 120 hours (elapsed time) after the effective date of this AD on Douglas fuselage numbers 105 and subsequent.

(a) Functionally operate all doors to insure that the downlocks are properly engaged in accordance with Douglas Alert Service Bulletin No. A52-145, dated May 16, 1975, or later FAA-approved revisions.

(b) If doors do not open, no further action is required, provided normal door operation is satisfactory.

(c) If the downlock does not prevent the door from opening, accomplish one or more of the following in accordance with Douglas Alert Service Bulletin A52-145, dated May 16, 1975, or later FAA-approved revisions.

(1) Check the rigging of the load feel cam, up/down lock cam, and downlock pawl roller, adjust as required, and repeat the functional test specified in paragraph (a), above.

(2) Replace the downlock pawl roller, and repeat the functional test specified in paragraph (a), above.

(3) Replace the up/down lock cam with one of the following cams, and repeat the functional test specified in paragraph (a), above.

(i) An investment cast cam (cadmium plate, dull chrome in appearance).

(ii) A machined cam (gunmetal, dull gray in appearance) that has been reinspected and verified to be within drawing tolerances. The cam must be marked with a yellow dot (approximately 3/8" diameter) to indicate that it was satisfactorily reinspected.

(iii) A machined cam that has been reworked in accordance with Douglas Engineering Order No. ABA8570, and Change A.

(4) Upon completion of the rerigging or modifications described in paragraph (c)(1), (c)(2), and (c)(3), above, perform a check of the door to insure normal operation.

(d) Equivalent inspections and installations may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiating data.

Airplanes may be flown to a base for performance of maintenance required by this AD, per FAR's 21.197 and 21.199, provided that, with respect to the doors identified as in need of maintenance, the slides or slide/rafts will be either removed or deactivated.

This supersedes the telegraphic AD adopted May 16, 1975.

This amendment becomes effective June 23, 1975.