AD 73-10-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-10-10 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, DC-10-30F and DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-30 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, DC-10-30F and DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-30F (KC-10A, KDC-10) | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, DC-10-30F and DC-10-40 Airplanes |
| aircraft | The Boeing Company | DC-10-40 | Airworthiness Directives; MCDONNELL DOUGLAS DC-10-10, DC-10-30, DC-10-30F and DC-10-40 Airplanes |
Unsafe Condition
Hydraulic fluid loss in the rudder standby power hydraulic system loops could induce an additional failure in an adjacent second hydraulic system and reduce flight control system margin capability.
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Required Actions
Install restrictors in the inlet to the motor side of the nonreversible motor pumps per Service Bulletin 29-40; modify hydraulic piping in the 2-1 nonreversible motor pump system per Service Bulletin 29-46; and install a system to shut off hydraulic flow to the motor side of the nonreversible motor pumps.
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Compliance Time
Within 1200 hours time in service after the effective date of this AD for aircraft not operated in flight more than 30 minutes flight time to a landing at a suitable airport as defined in FAR 121.197; within 300 hours time in service after the effective date for aircraft operated in flight more than 30 minutes flight time to a landing at a suitable airport as defined in FAR 121.197.
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Affected Aircraft
MCDONNELL DOUGLAS DC-10-10, DC-10-30, DC-10-30F (KC-10A, KDC-10), and DC-10-40 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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