AD 72-23-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 336 | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337 | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337A | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337B | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337C | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337D | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337E | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337F | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337G | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
| aircraft | Cessna Aircraft Company | 337H | Airworthiness Directives; CESSNA Models 336 and 337 Airplanes |
Unsafe Condition
Inadequate lubrication and contamination of the actuator jack screw could lead to inadvertent retraction of wing flaps and failure of electrical wing flap actuators.
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Required Actions
Inspect the actuator jack screw for lubricant condition and contamination at specified intervals. Remove, clean, and relubricate the jack screw as required. Modify the aircraft per Cessna Service Letter ME72-19 by April 1, 1973, making prior inspection requirements inapplicable.
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Compliance Time
Within the next 25 hours' time in service after the effective date (November 10, 1972), unless already accomplished within the previous 75 hours' time in service, and thereafter at intervals not to exceed 100 hours' time in service for inspections. The modification in Paragraph D must be completed by April 1, 1973.
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Affected Aircraft
Cessna Models 336 (Serial Numbers 336-0001 thru 336-0195) and 337 (Serial Numbers 337-0001 thru 337-0239) airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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