Service Bulletin

LETTER OF TRANSMITTAL

SERVICE BULLETIN SAAB 2000–38–010

TO: All holders of SAAB 2000 SERVICE BULLETIN.

This letter covers transmittal of the following Service Bulletin which should be included in the appropriate

section of your folder.

Initial issue of Service Bulletin SAAB 2000–38–010, 12 July 2013,”WATER/WASTE – POTABLE WATER

SYSTEM – DEACTIVATING OF THE POTABLE WATER SYSTEM”, cover sheet and 3 pages.

Saab AB (Publ) Date: 12 July 2013

Support and Services

Aircraft Services Division

Technical Communication

Mats Wagner
SERVICE BULLETIN

Number: SAAB 2000–38–010

Date: 12 July 2013

Subject: WATER/WASTE – POTABLE WATER SYSTEM – DEACTIVATING

OF THE POTABLE WATER SYSTEM

3 pages

The content of this document is proprietary and confidential to Saab AB and 

may not:

a) be used for any purpose other than those for which it was supplied;

b) be copied or reproduced in whole or in part without the prior written consent of 

Saab AB; nor

c) be disclosed to any third party without the prior written consent of Saab AB

Support and Services

Aircraft Services Division

SE–581 88 Linköping

Sweden Telephone: int+46 13 18 26 16 Telefax: int+46 13 18 41 83

Saab AB (Publ)
Service Bulletin

12 July 2013 2000–38–010

Page 1 of 3

ATA CHAPTER: 38

WATER/WASTE – POTABLE WATER SYSTEM – DEACTIVATING OF THE POTABLE

WATER SYSTEM

Mod No. –

1. PLANNING INFORMATION

A. EFFECTIVITY

(1) Aircraft:

Aircraft Mfg. Serial No’s SAAB 2000 – 004–016, 018, 022–024, 026, 029, 031–033, 035–039,

041–044, 046–048, 051, 053–063.

(2) Spares: Not affected.

B. REASON

One occurrence of water leakage at the inlet tubing for the in–line heater (25HY) has been reported

in the lower part of the forward fuselage (Zone 116). The in–line heater attachment was found

ruptured resulting in water spraying in the area.

This lead to a rudder pedal restriction caused by the frozen water on the rudder control mechanism

in zone 116.

Analysis after the reported event indicates that also the pitch control mechanism (including pitch

disconnect/spring unit) may in remote situation be frozen due to possible water spray also

preventing disconnection and normal pitch control leading to an unsafe condition.

As a temporary action the water system should be deactivated to avoid the unsafe condition. Saab

is working on a terminating action in order to eliminate the consequences of water spraying in the

area.

C. DESCRIPTION

This Service Bulletin gives instructions to deactivate the potable water system.

D. COMPLIANCE

Mandatory.

Saab recommends this Service Bulletin to be performed within 1 months from release of this Service

Bulletin

This Service Bulletin is under EASA consideration for an Airworthiness Directive.

The final compliance terms will be set by the EASA Airworthiness Directive (AD) when issued.

E. APPROVAL

The technical content of this Service Bulletin is approved under the authority of DOA nr.

EASA.21J.066.
Service Bulletin

12 July 2013 2000–38–010

Page 2 of 3

F. MANPOWER

Estimated time to complete this Service Bulletin is:

1 persons required.

Total manhours: 1

Elapsed time (hours): 1

Labour cost at operators expense.

G. MATERIAL – COST AND AVAILABILITY

(1) Sign, ”POTABLE SYSTEM INOPERATIVE” – Qty 4 (locally manufactured).

H. TOOLING

No special tooling required.

I. WEIGHT AND BALANCE

None.

J. ELECTRICAL LOAD DATA

Not affected.

K. REFERENCES

Aircraft Maintenance Manual (AMM) TASK 12–10–38–610–801

L. OTHER PUBLICATIONS AFFECTED

Not affected.

2. ACCOMPLISHMENT INSTRUCTIONS

A. JOB SET–UP

(1) Before you start the SB, make sure:

– The signs ”POTABLE SYSTEM INOPERATIVE” (locally manufactured) are available

– The documentation is available.

B. PROCEDURE

(1) Deactivate the potable water system

(a) Drain the potable water system (Ref AMM TASK 12–10–38–680–801).

(b) Open the circuit breakers

1 On the RH circuit breaker panel 12VU, open tag and safety the circuit breaker:

LABEL POS C/B

LAVATORY WATER HEATER S–32 1HVC

2 On the LH circuit breaker panel 11VU, open tag and safety the circuit breakers:

LABEL POS C/B

WATER HEAT PIPE J–33 3HY

WATER HEAT TANK J–34 1HY
Service Bulletin

12 July 2013 2000–38–010

Page 3 of 3

LABEL C/B POS

LAVATORY POTABLE WATER CTL 2 J–36 23MJ

LAVATORY POTABLE WATER CTL 1 J–35 25MJ

(c) At the galley panel, set the WATER/OFF switch to OFF. When you set the switch to OFF,

the bleed air shut–off valve closes and stop the bleed air supply from the air pressure

supply system.

(d) Put a sign ”POTABLE SYSTEM INOPERATIVE”:

– in the flight compartment

– in the lavatory

– on the galley panel

– Inside the water service door, 118BR (secure the sign with tape or equivalent).

3. MATERIAL INFORMATION

Not Applicable