Airworthiness Directive · Amendment 39-9073 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, 727 Series, 727C Series.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment supersedes an existing AD that currently requires periodic leak checks of the forward lavatory drain system and provides for the installation of a new drain valve as terminating action. This action continues to require various leak checks, but deletes a previously provided terminating action; adds requirements for leak checks of other lavatory drain systems; provides for the option of revising the FAA-approved maintenance program to include a schedule of leak checks; requires the installation of a cap on the flush/fill line; and requires either a periodic leak check of the flush/fill line cap or replacement of the seals on both that cap and the toilet tank anti-siphon (check) valve. This amendment was prompted by continuing reports of damage to engines and airframes, separation of engines from airplanes, and damage to property on the ground, caused by "blue ice" that had formed from leaking forward lavatory drain systems and subsequently had dislodged fromthe airplane. The actions specified by this AD are intended to prevent such damage associated with the problems of "blue ice."
