AD 60-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Corporation | 188A | LOCKHEED Model 188 Series Aircraft |
| aircraft | Lockheed Martin Corporation | 188C | LOCKHEED Model 188 Series Aircraft |
Unsafe Condition
Insufficient resistance to flammability of components of the AC Bus Transfer and Distribution Box has resulted in a fire. Temperatures within the AC Bus Transfer and Distribution Box and within the main electrical service center higher than that for which some of the equipment in these locations is designed contributes to over-temperature of the equipment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace black vinyl covered flexible bus assemblies with MIL-W-7139 wire jumpers within the AC Transfer and Distribution Box. Replace specified wires with MIL-W-7139 wire, apply fire retardant coating to specified boxes, replace terminal blocks with molded melamine ones, modify bus bars and terminals, route control wires separately, relocate circuit breaker, install forced air cooling systems including fans and ducting, and install a shield for hydraulic connectors.
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Compliance Time
within 1,000 hours' time in service after September 28, 1960
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Affected Aircraft
Lockheed Model 188 Series Aircraft Serial Numbers 1002, 1004 Through 1102, 1104 Through 1126, 2001 Through 2014
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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