Nose/Tail Landing Gear
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Owners and operators should verify that the potable water drain line connection at the outboard forward lavatory wall is securely clamped to prevent leaks. They should inspect for water accumulation or leaks near the nose wheel steering cables, especially after maintenance. Additionally, they should follow the post-installation system checkout procedures outlined in AeroControlex STC Installation Manual 80-0106, Section 8.0, to avoid pressurization of the potable water drain line. No specific compliance deadline is provided.
Summary
The FAA Special Airworthiness Information Bulletin SAIB: 2026-18 addresses a potential issue with the installation of AeroControlex Supplemental Type Certificate STC ST01255CH on Boeing 737-100, -200, -300, -400, and -500 Series airplanes. The bulletin informs operators about the risk of water leaking and freezing on the nose wheel steering cables due to a potable water drain line connection, which may impair nose wheel steering functionality. This information bulletin is advisory and does not mandate regulatory action.
What changed
This bulletin introduces awareness of a water leak and ice accumulation issue on nose wheel steering cables caused by the AeroControlex STC ST01255CH installation. It highlights that the potable water drain line may become pressurized and leak water, potentially freezing on the steering cables. The bulletin does not impose new regulatory requirements but provides recommendations to mitigate the risk.
Why it matters
This bulletin is important for aviation professionals because ice formation on nose wheel steering cables can reduce steering responsiveness during critical phases like landing and taxiing. Operators and maintenance personnel need to be aware of this potential hazard to ensure aircraft safety and prevent steering malfunctions. Understanding this issue helps maintain compliance with existing airworthiness standards and supports safe aircraft operation.
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