# Service Bulletin

22 October 2014 

# 2000–38–011

Page 1 of 13 

# ATA CHAPTER: 38 WATER / WASTE – INSPECTION OF THE IN–LINE HEATER AND INSTALLATION OF A SPRAY SHIELD

Mod No. 6505

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.

NOTE : This Service Bulletin is applicable for aircraft with option 38:201 or 38:201–1 installed.
(2) Spares: Not affected.

B. REASON
One occurrence of rudder pedal restriction has been reported. Subsequent investigation showed that this was the result of water spring leakage at the inlet tubing for the in–line heater (25HY) in the lower part of the forward fuselage (Zone 116) during refilling on ground.
The in–line heater attachment was found ruptured, which resulted in water spraying in the area. Frozen water on the rudder control mechanism in Zone 116 then led to the rudder pedal restriction. Analysis after the reported event indicates that the pitch control mechanism (including pitch disconnect/spring unit) may also be frozen as a result of water spray, which would prevent disconnection and normal pitch control.
This condition, if not corrected, could result in further occurrences of reduced control of the aircraft and a potential unsafe condition. Implementation of this Service Bulletin will remove the risk for uncontrolled leakage and water spray in zone 116 that may cause frozen parts of the flight control system.

C. DESCRIPTION
This Service Bulletin gives instructions for: – Inspection of the in–line heater 25HY for correct brazing. – If necessary, replacement or repair of faulty in–line heaters. – Installation of a spray shield on the inline heater. – Installation of a shrinkable tube on the water tube.

D. COMPLIANCE
Mandatory.
Saab recommends this Service Bulletin to be performed within 6 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.

NOTE : Implementation of this Service Bulletin terminates the actions mandated by Service Bulletin 2000–38–010 (EASA AD 2013–0172R1), Deactivation of the Potable Water System).

# Service Bulletin

22 October 2014 

# 2000–38–011

Page 2 of 13 E. APPROVAL This Service Bulletin is developed and approved under the authority of DOA nr. EASA.21J.066. The change addressed in the bulletin is classified as ”Major” in accordance with EC regulation 748/2012 Part 21A.91 and is approved by the European Aviation Safety Agency. Ref. EASA No. 10050850.

F. MANPOWER Estimated time to complete this Service Bulletin is: 1 persons required.

Total manhours: 6 Elapsed time (hours): Labour cost at operators expense.

G. MATERIAL – COST AND AVAILABILITY Price and availability for Mod Kit. No. SAAB 2000–38–011–01 will be furnished on request.

H. TOOLING (1) Magnifying glass. (2) Strong light source. (3) Heat gun.

I. WEIGHT AND BALANCE

Weight change 0.3 kg 0.66 lb Center of gravity STA 187.9 Change moment 0.56 kgin 1.24 lbin
100

J. ELECTRICAL LOAD DATA

Not affected.

K. REFERENCES
Aircraft Maintenance Manual (AMM) TASK 12–10–38–610–801 TASK 12–10–38–680–801 TASK 30–71–15–000–802 TASK 30–71–15–400–802 Attachment 1 – Photos

L. OTHER PUBLICATIONS AFFECTED
Aircraft Maintenance Manual (AMM) Illustrated Parts Catalog (IPC)

2. ACCOMPLISHMENT INSTRUCTIONS

A. JOB SET–UP (1) Before you start the SB, make sure: – The local supply items listed in the Service Bulletin are available – The documentation is available.

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22 October 2014 

# 2000–38–011

Page 3 of 13 (2) Get access
(a) Remove the access panel 116AR.
(3) Remove the in–line heater (Ref. AMM TASK 30–71–15–000–802).

B. INSPECTION
REF. FIG. 1, 2 and illustrations in attachment 1
(1) Do a detailed inspection of the in–line heater (1)
(a) Use a strong light source and a magnifying glass and inspect the brazing around the attachment for the in–line heater tube

1 If the brazing is acceptable, continue with Para C. Modification.

2 If the brazing is not acceptable, the in–line heater (1) must be replaced or repaired (contact Saab (details below) for a repair). When a new or repaired in–line heater (1) is available, continue with Para C. Modification.

Saab AB Business Area Support and Services Air Division Technical Support E–mail: Saab2000.techsupport@saabgroup.com Fax: +46 (0) 13 18 48 74

C. MODIFICATION
REF. FIG. 3, 4
(1) Make the two parts (02 and 04) of the shrinkable tube
(a) Measure and cut the shrinkable tube: – one piece in a length of 850 mm (33.5 in) (shrinkable tube (02)) – one piece in a length of 70 mm (2.7 in) (shrinkable tube (04)). (b) On the shrinkable tube (02), measure and mark out the position for the 7 cut outs (evacuation holes) (Ref. View D).
(c) Use a sharp tool and carefully make the 7 cut outs.
(2) Install the shrinkable tube (02) (Ref. View B and E)
(a) Remove the reducer from the water pipe (05). Keep the reducer for installation.
(b) From between STA 186.0 and 215, remove one screw each from the two two existing clamps that attach the water pipe (05). Remove and discard the two cushions that is installed between the existing clamps and the water pipe (05).
(c) Use masking tape or equivalent to hold the nut of the water pipe (05) in position during installation of the shrinkable tube (02).
(d) Carefully slide the shrinkable tube (02) over the water pipe (05). Make sure that the evacuation holes are facing outboard, against the lower fuselage skin.
(e) Use a suitable plate or equivalent as a heat shield and protect existing harnesses adjacent to the water pipe (05) when you shrink the shrinkable tube (02).
(f) With the evacuation holes in correct position, use the heat gun and shrink the shrinkable tube (02) at: – the two clamp points (Ref. View B) – the forward end of the water pipe (05) (Ref. View E).
NOTE : Do not install the two clamps at this time.

# Service Bulletin

22 October 2014 

# 2000–38–011

Page 4 of 13 (3) Install the shrinkable tube (the tube) (04) (Ref. View F).
(a) Slide the tube (04) over the forward part of the water pipe (05) and part of the tube (02).
(b) Install the reducer on the water pipe. Hold the union of the water pipe (05) and tighten the reducer.
(c) Make sure the tube (04) cover the union of the water tube and the fwd end of the tube (02).
(d) Use a heat gun and shrink the tube (04).
(4) Install the spray shield together with the in–line heater
(a) Prior installation of the in–line heater, install the spray shield (01) over the in–line heater. Make sure the spray shield (01) is installed with the wide part at the lower end of the in–line heater.
(b) Fold the wide part of the spray shield (01) inside out in order to achieve better access for the installation of the in–line heater to the water pipe (05).
(c) Apply a small amount of grease on the upper nut of the in–line heater and the reducer. This will make is easier to push the spray shield (01) over the forward part of the water pipe (05).
(d) Install the in–line heater (Ref. AMM TASK 30–71–15–400–802).
(e) Push the spray shield (01) back until it is tight against the reducer.
(f) Install the strap band (TY28M) and make sure there is a tight fit against the shrink tube (04).
(g) Protect the in–line heat wires for the thermostat and the heater element against chafing between the spray shield and the aircraft structure.

REF. FIG. 4

1 Install convoluted tube (06) around the in–line heat wires (07) for the thermostat and the heater element.

2 If necessary, strap the wiring.
(h) Fold back the spray shield (01).
(5) Install and tighten the two removed screws for the clamps that attach the water pipe (05).

D. JOB CLOSE–UP

NOTE : All step within Job Close–up may not be applicable for aircraft operating with alternative filling procedure in accordance with Saab Service Newsletter SN2000–1304.
(1) Activate the potable water system
(a) Close the circuit breakers

1 On the RH circuit breaker panel 12VU, remove the tag and close the circuit breaker:

LABEL POS C/B

LAVATORY WATER HEATER S–32 1HVC

2 On the LH circuit breaker panel 11VU, remove the tag and close the circuit breakers:

LABEL POS C/B

WATER HEAT PIPE J–33 3HY
WATER HEAT TANK J–34 1HY

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# 2000–38–011

Page 5 of 13 LABEL C/B POS

LAVATORY POTABLE WATER CTL 2 J–36 23MJ
LAVATORY POTABLE WATER CTL 1 J–35 25MJ

(b) At the galley panel, set the WATER/OFF switch to WATER.
(c) Fill the potable water system (Ref AMM TASK 12–10–38–610–801) and at the same time, make sure that there is no visible water leakage.
(d) Remove the sign ”POTABLE SYSTEM INOPERATIVE” from: – the flight compartment – the lavatory – the galley panel – the inside of the water service door 118BR. (2) Close the access.
(a) Remove all the tools and equipment from the work area. Make sure the work area is clean.
(b) Install the access panel 116AR.
(c) Close the water service door 118BR.
(3) Remove all the tools and equipment from the work area. Make sure the work area is clean.

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22 October 2014 

# 2000–38–011

Page 6 of 13 3. MATERIAL INFORMATION

A. Modification Kit No SAAB 2000–38–011–01 contains:

Item Part Number Qty Nomenclature Designation Remarks
01 IFNB001159 1 Spray Shield – –
03 MS35842–12 1 Clamp – – – RNF–100–1 1/4–0 Length:
1000 mm (39.4 in) Shrinkable tube – Item 02 and 04 made of this
item.
Length Item 02: 850 mm (33.5)
Length Item 04: 70 mm (2.7)

06 HCTE–0281–0–BL 200 mm
(7.9 in) Convoluted tube – –

– TY28M

O/T

T50L

O/T

T50LNN3B 1 Strap band – Tie–wrap

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22 October 2014 

# 2000–38–011

Page 7 of 13 B18982 

## 1 (25 HY) REDUCER WATER TUBE CLAMPS

AREA TO BE INSPECTED



# In–line Heater – Inspection FIG. 1

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22 October 2014 

# 2000–38–011

Page 8 of 13 A

B18797 

## NOT ACCEPTABLE ACCEPTABLE SMOOTH AND EVEN FILLET



# VIEW A PORES AND CAVITIES

NOTE :TYPICAL VIEW



# In–line Heater – Detailed Inspection FIG. 2Service Bulletin22 October 20142000–38–011Page 9/10 of 1301020505REFB18983Spray Shield – InstallationFIG. 3 (Sheet 1 of 2)

# Service Bulletin

Date Month Year

Revison X, Date Month Year 

# 2000–XX–XXX

Page 10Service Bulletin22 October 20142000–38–011Page 11/12 of 13B189845 mm (0.2 in) R 5 mm (0.2 in)7 x 100 (= 700 mm (27.6 in))100 mm (3.94 in)850 mm (33.5 in)Spray Shield – InstallationFIG. 3 (Sheet 2 of 2)

# Service Bulletin

Date Month Year

Revison X, Date Month Year 

# 2000–XX–XXX

Page 12

# Service Bulletin

22 October 2014 

# 2000–38–011

Page 13 of 13 07 06

06

07

NOTE: SPRAY SHIELD NOT SHOWN

B19019 

# Spray Shield – Installation of convoluted tube FIG. 4