Boeing 787s Must Check Door Water Straps for Safety
Published Date: 4/29/2026
Rule
Summary
If you fly on certain Boeing 787 planes, this new rule means crews must check special water system parts near some doors to make sure safety straps are there and installed right. Boeing found some parts missing these straps and fixed the design, so now old parts can’t be put back. These checks start June 3, 2026, helping keep flights safe without big costs.
Analyzed Economic Effects
4 provisions identified: 1 benefits, 3 costs, 0 mixed.
Mandatory inspections on Boeing 787 water fittings
If you fly on certain Boeing 787-8, 787-9, or 787-10 airplanes, crews/operators must do detailed inspections of all clamshell couplings at door 1 and door 3 lavatories and galleys with potable water systems to confirm a safety strap is present and correctly installed. These inspection requirements are retained and extended by the new AD and are effective June 3, 2026; required actions and compliance times are specified in Boeing Alert Requirements Bulletins dated August 12, 2022 and February 28, 2025.
Operators must perform on-condition repairs
If inspections find missing or incorrectly installed safety straps, operators must correct the installation, replace any clamshell coupling that lacks a strap with a new coupling that has a safety strap, and perform a water leak test as specified in the Boeing Alert Requirements Bulletins. The AD retains prior inspection requirements and adds new required actions for airplanes listed in the February 28, 2025 Requirements Bulletin; compliance follows the Bulletin schedules and is effective June 3, 2026.
FAA cost estimates for U.S. operators
The FAA estimates this AD affects 165 U.S.-registered airplanes. Estimated costs: a retained clamshell coupling inspection is 1 work-hour at $85 ($85 per product; $14,025 total on U.S. operators), and the new safety strap inspection is estimated at 27 work-hours x $85 = $2,295 per lavatory/galley (FAA totals $238,680 for 104 airplanes). On-condition costs include $85 to correct an incorrectly installed strap and up to $607 per lavatory/galley to install a coupling with a strap and perform a leak test.
Parts installation prohibition for old couplings
As of the AD effective date (June 3, 2026), no person may install clamshell coupling P/N 14C02-08C (AS1655C08) or P/N 14C02-08A (AS1655A08) at inspection locations where those part numbers have been replaced with P/N 14C34-08C or P/N 14C33-08 on any airplane. The prohibition applies to all airplanes in the AD applicability (Model 787-8, -9, and -10) as specified in the AD.
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