AD 99-19-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 14-H | Airworthiness Directives; Lockheed Model L-14 and L-18 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 14-H2 | Airworthiness Directives; Lockheed Model L-14 and L-18 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 14-N | Airworthiness Directives; Lockheed Model L-14 and L-18 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 14-N2 | Airworthiness Directives; Lockheed Model L-14 and L-18 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 14-N3 | Airworthiness Directives; Lockheed Model L-14 and L-18 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 18 | Airworthiness Directives; Lockheed Model L-14 and L-18 Series Airplanes |
Unsafe Condition
Failure to activate the airframe pneumatic deicing boots at the first signs of ice accumulation in icing conditions can lead to reduced controllability due to adverse aerodynamic effects of ice adhering to the airplane prior to the first deicing cycle.
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Required Actions
Revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) within 10 days after the effective date to include specific requirements for activation of the wing and tail pneumatic deicing boots at the first sign of ice formation or ice detector annunciation. The system must remain in automatic cycling mode or be manually cycled as needed, and may only be deactivated after completing an entire deicing cycle post-icing conditions.
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Compliance Time
Within 10 days after the effective date of this AD
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Affected Aircraft
Lockheed Model L-14 and L-18 series airplanes equipped with pneumatic deicing boots, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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