AD 69-26-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Model L-188 Series Airplanes |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Model L-188 Series Airplanes |
Unsafe Condition
The takeoff warning system may not arm at ambient temperatures below 23 degrees F, potentially failing to alert pilots during takeoff power settings at lower temperatures.
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Required Actions
Install a cockpit placard within 50 hours time in service stating the system won't arm below 23°F. Modify the arming switches within 3000 hours time in service to arm at 68-70°F power lever advancement per SB 88/SB-672 or equivalent.
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Compliance Time
Within 50 hours time in service after the effective date of this AD for the placard installation, and within 3000 hours time in service for the arming switches modification.
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Affected Aircraft
Lockheed L-188 airplanes listed in Service Bulletin 88/5B-672 or later FAA-approved revisions, and any other L-188 with the takeoff warning system installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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