Airworthiness Directive · Amendment 39-11610 · McDonnell Douglas MD-11 Series Airplanes
McDonnell Douglas MD-11 Series Airplanes
Superseded. A later AD replaced this one: AD 2000-08-03. Comply with the one in force.
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 | 48679 | 48754 | 48623 | 48770 | 48753 |
| 48773 | 48774 | 48755 | 48758 | 48775-48779 inclusive | |
| 48624 | 48756 | 48780 | 48532 |
| 48555 | 48556 | 48581 | 48630 | 48557 | 48539 |
| 48558 | 48559 | 48616 | 48560 | 48617 | 48618 |
| 48561 | 48629 | 48562 | 58563 | 48757 | 48540 |
| 48564 | 48634 | 48541 | 48798 | 48781-48792 inclusive | |
| 48794 | 48799 | 48801 | 48800 | 48802-48806 inclusive |
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 (c) 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 adopts a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas MD-11 series airplanes. This action requires the deactivation of the forward and center cargo control units (CCU). This amendment is prompted by a report of failure of a CCU which produced overheating of the electrical pins inside the CCU; the subsequent release of hot gases and flames ignited an adjacent insulation blanket. The actions specified in this AD are intended to prevent such conditions, 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: Within 15 days after the effective date of this AD, deactivate the forward and center CCU's in accordance with the following procedures:
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 |
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: Within 15 days after the effective date of this AD; deactivate the forward and center CCU in accordance with the following procedures:
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 |
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 |
