AD 61-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-8-11 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-12 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-21 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-31 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-32 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-33 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-41 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-42 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-43 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
| aircraft | The Boeing Company | DC-8-51 | Airworthiness Directives; DOUGLAS All DC-8 Series Aircraft |
Unsafe Condition
Failure to provide an accurate indication of reserve hydraulic fluid quantity in the system reservoir could result in insufficient hydraulic fluid leading to system failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace or modify the cockpit hydraulic quantity gage and reservoir quantity transmitter per Douglas Service Bulletin DC-8 A29-40 (Reissue No. 1 or later) or FAA-approved equivalent to indicate reserve fluid down to approximately one gallon with ≤10% error. Mark the gage dial into three segments (NORMAL, AUX., EMER.) corresponding to fluid levels.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 150 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
DOUGLAS All DC-8 Series Aircraft including models DC-8-11, DC-8-12, DC-8-21, DC-8-31, DC-8-32, DC-8-33, DC-8-41, DC-8-42, DC-8-43, DC-8-51, and others as listed
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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