AD 48-52-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6 Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6 Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6 Aircraft |
Unsafe Condition
Failure of the power leads connection to the main bus through Burndy limiters, abrasion of generator and starter cables in the No. 4 nacelle, inadequate stainless steel ducting on heaters, nacelle fluids contacting exhaust piping, insufficient turbine oil drainage, improper CO2 bottle configuration for wing heaters, and inadequate ducting of combustion air blowers could lead to electrical failures, cable damage, heater malfunctions, fluid leaks, oil system issues, fire hazards, and ineffective fire suppression systems.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise power leads connection method using Burndy limiters, reroute generator and starter cables in No. 4 nacelle, install stainless steel combustion air intake ducting on heaters, revise wing heater exhaust outlets, install expansion turbine oil drains and filling drains, install ducting from heaters to nacelle/tail skin with stainless steel nacelle ducting, and reconfigure CO2 system by deleting wing heater CO2 bottles and integrating fuselage nose CO2 banks with the heater fire extinguisher system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
not later than June 1, 1949
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Affected Aircraft
The Boeing Company DC-6, DC-6A, DC-6B aircraft
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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