AD 96-01-51 Airworthiness Directives; Boeing Model 747-100 and -200 Series Airplanes Modified in Accordance With Supplemental Type Certificate (STC) SA2322SO or SA4227NM-D.

Models named: 747-100 series. Read the applicability below — it usually turns on serial or part numbers too.

Model 747-100 series airplanes having serial numbers 19637, 19638, 19642, 19647, 19648, 19657, 19725, 20320, and 20347, that have been modified in accordance with Supplemental Type Certificate (STC) SA2322SO; and Model 747-200 series airplane having serial number 20010 that has been modified in accordance with STC SA4227NM-D; certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise 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 use the authority provided in paragraph (d) of this AD to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD.

Required as indicated, unless accomplished previously. To prevent malfunction of the safety interlock system of the main deck cargo door and subsequent rapid decompression of the airplane due to in-flight opening of the main deck side cargo door, accomplish the following: (a) Notwithstanding the requirements of paragraph E. of AD 90- 09-06, amendment 39-6581, within 3 days after the effective date of this AD, deactivate the ``LATCHES UNLOCKED'' light at the door operating panel and the ``DOOR UNLOCKED'' light at the flight engineer (F/E) panel; and fabricate and install placards; in accordance with a method approved by the Manager, Atlanta Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. (b) Within 3 days after the effective date of this AD, accomplish the requirements of paragraphs (b)(1), (b)(2), (b)(3), (b)(4), (b)(5), AND (b)(6) of this AD. Repeat these procedures thereafter prior to each flight. These procedures must be performed by properly trained and qualified maintenance personnel. (1) Close the main deck side cargo door in accordance with normal operations procedures. (2) Unscrew, lift, and secure the door lower access panels in the ``UP'' position. (3) Perform a visual inspection of all 12 latch and lock arms to ensure that they are overcenter in the ``LOCKED'' position and that all alignment marks line-up correctly. (4) Perform a detailed visual inspection to ensure that the ten photo scanner alignment holes in latches 2 through 11 have no obstructions. (i) Counting forward to aft, install pins in photo scanner alignment holes in latch assemblies 2 through 11. The safety pins must engage the lock arm and latch arm lever, and go completely through the latch assembly. (ii) All latch safety pins must be fastened together with a safety cable, and the safety cable must be attached to the main deck door sill protector. (iii) Lower and secure the lower access panels in place. (iv) Open circuit breaker HC5, located on P-10, main power center-left. (5) To close the pressure vent door on the main deck side cargo door, accomplish paragraphs (b)(5)(i), (b)(5)(ii), (b)(5)(iii), AND (b)(5)(iv) of this AD: (i) Remove pressure vent door cover; (ii) Manually retract the two solenoid valves to allow pressure vent door closure; (iii) Close pressure vent door; and (iv) Replace vent door cover. (6) All safety pins must be removed before opening or operating cargo door. (c) Accomplishment of a modification in accordance with a method approved by the Manager, Atlanta ACO, FAA, Small Airplane Directorate, constitutes terminating action for the requirements of this AD. (d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Atlanta ACO, FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta ACO. Note 2: Information concerning the existence of approved alternative methods of [[Page 1705]] compliance with this AD, if any, may be obtained from the Atlanta ACO. (e) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (f) This amendment becomes effective on January 29, 1996, to all persons except those persons to whom it was made immediately effective by telegraphic AD T96-01-51, issued on January 3, 1996, which contained the requirements of this amendment. Issued in Renton, Washington, on January 17, 1996. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 96-845 Filed 1-22-96; 8:45 am] BILLING CODE 4910-13-P