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99-19-17: AFM - Limitation Section - Ice Protection System

FAA order 99-19-17 is an airworthiness directive in force since December 27, 1999. The FAA's subject line: AFM - Limitation Section - Ice Protection System. It names Lockheed 1329: about 6 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: heating, ice protection and utility systems.

What it applies to as the FAA lists it

Kind of product: Aircraft
Makes: Lockheed Martin Corporation
Models: 1329-23A, 1329-23D, 1329-23E, 1329-25
On this site: Lockheed 1329 6 registered

Dates and paperwork

In force since: December 27, 1999
Published: November 22, 1999 (signed November 10, 1999)
Docket: 99-NM-151-AD
Status: Current
The FAA's document: Read the order on the FAA's site

The FAA's summary their words, unchanged

This amendment adopts a new airworthiness directive (AD), applicable to certain Lockheed Model 1329-23 and 1329-25 series airplanes, that requires revising the Airplane Flight Manual (AFM) to include requirements for activation of the airframe pneumatic deicing boots. This amendment is prompted by reports of inflight incidents and an accident that occurred in icing conditions where the airframe pneumatic deicing boots were not activated. The actions specified by this AD are intended to ensure that flightcrews activate the pneumatic wing and tail deicing boots at the first signs of ice accumulation. This action will prevent reduced controllability of the aircraft due to adverse aerodynamic effects of ice adhering to the airplane prior to the first deicing cycle.

The order itself the regulatory text, as published

Show the full text (2,365 characters)

99-19-17  LOCKHEED:  Amendment 39-11306.  Docket 99-NM-151-AD.  

	Applicability:  Model 1329-23 and 1329-25 series airplanes equipped with pneumatic deicing boots, certificated in any category. 

	Compliance:  Required as indicated, unless accomplished previously. 

	To ensure that flightcrews activate the wing and tail pneumatic deicing boots at the first signs of ice accumulation on the airplane, accomplish the following: 

	(a)	Within 10 days after the effective date of this AD:  Revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to include the following requirements for activation of the ice protection systems.  This may be accomplished by inserting a copy of this AD in the AFM. 

"Except if the AFM otherwise specifies that deicing boots should not be used for certain phases of flight (e.g., take-off, final approach, and landing), compliance with the following is required. 

Wing and Tail Leading Edge Pneumatic Deicing Boot System, if installed, must be activated: 

		-  At the first sign of ice formation anywhere on the aircraft, or upon annunciation from an ice detector system, whichever occurs first; and 

		-  The system must either be continued to be operated in the automatic cycling mode, if available; or the system must be manually cycled as needed to minimize the ice accretions on the airframe. 

"The wing and tail leading edge pneumatic deicing boot system may be deactivated only after completion of an entire deicing cycle after leaving icing conditions." 

	(b)	An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Atlanta Aircraft Certification Office, Small Airplane Directorate, .  The request shall be forwarded through an appropriate FAA Operations Inspector, who may add comments and then send it to the Manager, Atlanta ACO. 

	NOTE 1:  Information concerning the existence of approved alternativemethods of compliance with this AD, if any, may be obtained from the Atlanta ACO. 

	(c)	Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. 

	(d)	This amendment becomes effective on December 27, 1999.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 7, 2026. Connections as data: /graph/directive/99-19-17.json · aircraft systems.