AD 72-20-03

final rule
Data completeness: 70%

Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes

AD Number
72-20-03
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft Textron Aviation Inc. 65-90 Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes
aircraft Textron Aviation Inc. 65-A90 Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes
aircraft Textron Aviation Inc. 99 Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes
aircraft Textron Aviation Inc. 99A Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes
aircraft Textron Aviation Inc. A99A Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes
aircraft Textron Aviation Inc. B90 Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes
aircraft Textron Aviation Inc. B99 Airworthiness Directives; BEECH Models 65-90, 65-A90, B90, 99, 99A, A99A and B99 Airplanes

Unsafe Condition

Heater overheat melts the windshield defroster ducting, damages wiring beneath the instrument panel, and fills the cabin with smoke.

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Required Actions

Prohibit heater operation if the ventilation blower is not functioning. Prior to each flight, determine the ventilation blower is operating. Within 25 hours' time in service after the effective date, replace vent blower and combustion differential switches with Beech P/N 90-380010-1 differential pressure switches per Service Instructions No. 0500-412 or later. Inspect heater fuse for proper standard value and install correct fuse if needed before further flight.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Effective immediately for prohibitions and checks. Within 25 hours' time in service after September 27, 1972, for switch replacement and fuse inspection.

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Affected Aircraft

BEECH Models 65-90, 65-A90, B90 (Serial Numbers LJ-1 thru LJ-501) and Models 99, 99A, A99A, B99 (Serial Numbers U-1 thru U-151).

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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