AD 99-01-16

final rule
Data completeness: 70%

Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes

AD Number
99-01-16
Status
final_rule
Effective Date
Product Category
aircraft
Docket
97-NM-238-AD
FR Citation
(Federal Register: January 08, 1999 (Volume 64, Number 5))

Applicability

TypeManufacturerModelDetails
aircraft The Boeing Company 737-100 Series Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes
aircraft The Boeing Company 737-200 Series Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes
aircraft The Boeing Company 737-300 Series Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes
aircraft The Boeing Company 737-400 Series Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes
aircraft The Boeing Company 737-500 Series Airworthiness Directives; BOEING Model 737-100, -200, -300, -400, and -500 Series Airplanes

Unsafe Condition

Damage to the horizontal stabilizer, engine flameout caused by ice formed from water drained inadvertently through a mispositioned selector valve.

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

Required Actions

Install a placard warning cabin crew not to put the selector valve for the forward lavatory water supply in the 'DRAIN' position during flight. Install an isolation valve in the drain line downstream of the selector valve, which terminates the placard requirement.

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Compliance Time

within 6 months for placard installation; isolation valve installation must be accomplished within the compliance time required for the placard to preclude the need for the placard.

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Affected Aircraft

Boeing Model 737-100, -200, -300, -400, and -500 series airplanes with forward lavatories installed.

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

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

View Official Source ↗ Find More ADs for The Boeing Company 737-100 Series

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