Airworthiness Directive · Amendment 39-12024 · McDonnell Douglas Model MD-11 Series Airplanes
McDonnell Douglas Model MD-11 Series Airplanes
Model MD-11 series airplanes, certificated in any category, having the serial numbers listed below.
| 48565 | 48566 | 48533 | 48549 | 48470 | 48406 |
| 48504 | 48602 | 48603 | 48571 | 48439 | 48605 |
| 48572 | 48471 | 48573 | 48600 | 48601 | 48633 |
| 48513 | 48574 | 48575 | 48542 | 48543 | 48576 |
| 48415 | 48631 | 48544 | 48632 | 48577 | 48545 |
| 48578 | 48546 | 48743 | 48744 | 48747 | 48748 |
| 48745 | 48746 | 48749 | 48579 | 48766 | 48768 |
| 48767 | 48769 | 48754 | 48623 | 48770 | 48753 |
| 48773 | 48774 | 48755 | 48758 | 1 48775-48779 | |
| 48624 | 48756 | 48780 | 48532 |
| 48555 | 48556 | 48581 | 48630 | 48557 | 48539 |
| 48558 | 48559 | 48616 | 48560 | 48617 | 48618 |
| 48561 | 48629 | 48562 | 48563 | 48757 | 48540 |
| 48564 | 48634 | 48541 | 48798 | 1 48781-48792 | |
| 48794 | 48799 | 48801 | 48800 | 1 48802-48806 |
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 (f) 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 supersedes an existing airworthiness directive (AD), applicable to certain McDonnell Douglas Model MD-11 series airplanes, that currently requires deactivation of the forward and center cargo control units (CCU). This amendment requires, among other actions, a general visual inspection to verify that all six external connectors of suspect CCU's have a certain part number stamped on the connector bodies on all CCU assemblies, and follow-on actions, which would constitute terminating action for the deactiviation requirements. The actions specified by this amendment are intended to prevent overheating of the electrical pins inside the CCU's and subsequent release of hot gases and flames, which could result in smoke and fire in the cargo compartment.
To prevent overheating of the electrical pins inside the cargo control units (CCU) and subsequent release of hot gases and flames, which could result in smoke and fire in the cargo compartment, accomplish the following:
(a) For Group 1 airplanes having serial numbers other than that identified in paragraph (c) of this AD: Within 15 days after March 20, 2000 (the effective date of AD 2000-05-01, amendment 39-11610), deactivate the forward and center CCU's in accordance with the following procedures:
(1) Remove the access panel to the forward cargo compartment CCU circuit breaker panel located at fuselage station 1009.300 (right side looking aft). Pull and collar the following circuit breakers:
| B1-506 | B1-489 | B1-488 | B1-487 | B1-486 |
| B1-485 | B1-480 | B1-481 | B1-498 | B1-482 |
| B1-500 | B1-495 | B1-499 | B1-490 |
(2) Remove the access panel to the center cargo compartment CCU circuit breaker panel located at fuselage station 1701.000 (right side looking aft). Pull and collar the following circuit breakers:
| B1-552 | B1-762 | B1-761 | B1-760 | B1-759 |
| B1-758 | B1-518 | B1-519 | B1-751 | B1-520 |
| B1-753 | B1-764 | B1-752 | B1-763 |
(b) For Group 2 airplanes having serial numbers other than that identified in paragraph (c) of this AD: Within 15 days after March 20, 2000, deactivate the forward and center CCU's in accordance with the following procedures:
(1) Remove the access panel to the forward cargo compartment CCU circuit breaker panel located at fuselage station 1009.300 (right side looking aft). Pull and collar the following circuit breakers:
| B1-506 | B1-489 | B1-488 | B1-487 | B1-486 |
| B1-485 | B1-480 | B1-481 | B1-498 | B1-482 |
| B1-500 | B1-495 | B1-499 | B1-490 |
(2) Remove the access panel to the center cargo compartment CCU circuit breaker panel located at fuselage station 1701.000 (right side looking aft). Pull and collar the following circuit breakers:
| B1-552 | B1-762 | B1-761 | B1-760 | B1-759 |
| B1-758 | B1-518 | B1-519 | B1-751 | B1-520 |
| B1-753 | B1-764 | B1-752 |
(c) For Group 1 airplane, serial number 48769, and for Group 2 airplane, serial number 48563: Within 15 days after May 5, 2000 (the effective date of AD 2000-08-03, amendment 39-11689), accomplish the actions specified in either paragraph (a) or (b) of this AD, as applicable.
(d) For Group 1 and Group 2 airplanes: Within 90 days after the effective date of this AD, perform an inspection to determine the part number of the CCU's.
(1) If both CCU's have part number (P/N) 462650-21, 462650-22, or 462650-23, the deactivation specified in paragraphs (a), (b), and (c) of this AD is no longer required, and the CCU's may be reactivated.
(2) If any CCU has a part number (P/N) other than 462650-21, 462650-22, or 462650-23, within 90 days after the effective date of this AD, perform a general visual inspection to verify that all six external connectors of the CCU have P/N M83723/71XXXXXX or P/N M83723/72XXXXXX stamped on the connector bodies on all TRW Aeronautical Systems, Lucas Aerospace, CCU assemblies, in accordance with Boeing Alert Service Bulletin MD11-25A253, dated March 10, 2000.
Note 2: McDonnell Douglas Service Bulletin MD11-25A253, dated March 10, 2000, references TRW Aeronautical Systems, Lucas Aerospace Alert Service Bulletin 462650-25-A01, dated March 10, 2000, as an additional source of service information to accomplish the inspection described above and corrective actions described below.
(i) If any connector has a P/N other than M83723/71XXXXXX or M83723/72XXXXXX, prior to further flight, replace the CCU with a spare CCU from the operator's stock that has one of the following P/N: 462650-21, 462650-22, or 462650-23. Following accomplishment of the replacement, the deactivation specified in paragraphs (a), (b), and (c) of this AD is no longer required, and the CCU's may be reactivated.
(ii) If any connector has P/N M83723/71XXXXXX or P/N M83723/72XXXXXX, prior to further flight, modify the rear cover (40) of the CCU assembly (including aligning the center hole of the insulator with the center hole on the rear cover (40), and ensuring that the top edge of the insulator is parallel to the top edge of the rear cover), and reidentify the CCU, in accordance with the service bulletin. Following accomplishment of the modification, the deactivation specified in paragraphs (a), (b), and (c) of this AD is no longer required, and the CCU's may be reactivated.
(e) As of the effective date of this AD, no person shall install on any airplane any part (identified under “Key Word”), having a “Spare Part No.” listed in paragraph 2.D., “Parts Necessary to Change Spares,” of Boeing Alert Service Bulletin MD11-25A253, dated March 10, 2000.
