AD 60-01-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Models 188A and 188C Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Models 188A and 188C Aircraft |
Unsafe Condition
The design of the propeller deicing power transfer relay (Lockheed P/N 613649-1, Leach P/N 9202-4516) allows plastic relay body cold flowing, which prevents terminals from remaining properly tightened over time.
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Required Actions
Deactivate the propeller deicing system by pulling the control circuit breaker at the forward load center and placarding it inoperative. Disconnect 8-gauge power wires from the priority buses, type and stow them. Reapply Icex compound (B.F. Goodrich Adhesive Depressant No. 6) to propeller blade fairing heater boots and spinners every 6 hours of precipitation exposure or 50 hours elapsed time, whichever comes first. To reactive the system, replace the original relay with a new Hartman B124-GL (Lockheed P/N 613422-17) per approved installation.
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Compliance Time
On arrival at the next station with maintenance personnel and at main base
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Affected Aircraft
Lockheed Models 188A and 188C Aircraft, all serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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