Potable Water for Compressor Wash [PW11]

TASK 70-27-00-910-802-A
Potable Water for Compressor Wash

ZONE: 400

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

B. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-803-A	SPS 87 - Gaspath/Compressor Solution

3. Job Set-up
Subtask 70-27-00-869-051-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 70-27-00-910-051-A ** ON A/C NOT FOR ALL

A. Potable water quality specifications (compressor wash):
(1) Always obey the specific procedures and limits in the Aircraft Maintenance Manuel (AMM) maintenance task.

NOTE: Maintenance manuals use potable water for rinsing after detergent washing.

NOTE: SPS 87 gaspath/compressor solution uses potable water in its make-up. For the make-up of this solution, you can refer to (Ref. AMM TASK 70-27-00-910-803).

(2) The quality specifications for potable water suitable for engine gaspath cleaning are as follows:
(a) Water used for engine gaspath cleaning must agree with local quality specifications for potable water and with the quality specifications that follows:

NOTE: When the local quality specifications for potable water and quality specifications that follow do not agree, the quality specifications that follow are applicable.

Property	Permitted Levels
Physical properties (analysis at 75 deg.F (24 deg.C)):
pH	6.0 - 10.0
Total dissolved solids	500 mg/l maximum
Specific resistance	1800 ohms-cm minimum
Or
Conductivity	550 microsiemens/cm maximum
Inorganic content:
Chlorides	250 mg/l maximum
Fluoride	2.0 mg/l maximum

Table - Potable water quality specifications (compressor wash)

[Rev.10 from 2021] 2026.04.01 12:54:24 UTC