AirComm Corporation Bell 407 Heating System Instructions for Continued Airworthiness OEM User Manual

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-4   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
3. REMOVAL, INSTALLATION / REPLACEMENT OF CABIN AFT HEATER EJECTOR 
ASSEMBLY (Figure 6.3 & 6.4) 
REMOVAL 
A.  Remove inboard seat pan fasteners from S-9241EC-12 aft heater assembly supports. 
B.  Remove S-9240EC-15 shield for RH side heater assembly removal. 
C. Position heater assembly to disconnect ejector tube B-Nut from bleed air plumbing for 
removal. 
INSTALLATION / REPLACEMENT 
A.  Loosen ejector mounting screws on back side of heater assembly.  Adjust ejector location 
so tube connection is flush.  It may be necessary to remove the air inlet screen for access 
to bleed air plumbing.  
B.  Connect bleed tube to ejector B-Nut.  To ensure proper torque, align connection and 
thread B-Nut until metal on metal contact is felt.  Continue to tighten an additional 60 
degrees of rotation and safety wire per paragraph 1. 
C. Tighten ejector mounting screws and install heater assembly by installing seat pan 
fasteners to heater assembly supports.  Install S-9240EC-15 shield for RH side heater 
assembly. 
 
 
 
 
 
View B – B (pg 6-3) 
Figure 6.4 Aft Flow Control Heater Assembly 
(Looking Inboard LH Side) 
S-9241EC-2 LH Aft Heater Assy 
S-9240EC-2 RH Aft Heater Assy 
ES39300-4 
Flow Control Knob 
S-9241EC-12 
Support (2 pls)  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-5   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
4.  REMOVAL, INSTALLATION / REPLACEMENT OF HEATER SHUTOFF VALVE (Figure 6.5 & 
6.6) 
REMOVAL 
A.  Disconnect bleed air plumbing from shutoff valve. 
B.  Loosen socket/plug clamp and disconnect electrical connection. 
C.  Remove bracket mounting screws from engine deck and remove shutoff valve.  Retain S-
9420EC-12 bracket for replacement shutoff valve. 
 
 
 
 
 
 
 
 
 
 
Figure 6.6 Shutoff Valve Electrical Connection 
(Looking Down) 
Figure 6.5 Shutoff Valve 
(Looking Outboard)  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-6   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
INSTALLATION/REPLACEMENT 
A.  Install S-9420EC-12 bracket on replacement shutoff valve and secure bracket to engine 
deck with mounting screws. 
B.  Connect electrical connection and tighten socket/plug clamp.  
C.  Connect bleed air plumbing to shutoff valve. 
D.  To ensure proper torque, align connection and thread until metal on metal contact is felt.  
Continue to tighten an additional 60 degrees of rotation and safety wire per step 1. 
 
5.  REMOVAL, INSTALLATION / REPLACMENT OF HEATER CONTROL VALVE. (Figure 6.7) 
REMOVAL 
A.  Remove the panel located under the Pilots and Co-pilots seats to gain access to the 
heater control valve. 
B.  Disconnect bleed air plumbing from heater control valve. 
C.  Remove heater control valve knob and placard. 
D.  Remove two mounting screws and remove heater control valve. 
INSTALLATION / REPLACEMENT 
A.  Position heater control valve and connect bleed air plumbing. 
B.  Install two mounting screws, control valve knob and placard. 
C.  To ensure proper torque, align connection and thread B-Nut until metal on metal contact is 
felt.  Continue to tighten an additional 60 degrees of rotation and safety wire per step 1. 
 
 
 
Figure 6.7 Heater Control Valve 
(Looking Down) 
S-9207EC-1 Defroster Control Valve 
ES39300-1 Control Knob 
S-9868-2 Placard 
S-9268EC-1 Heater Control Valve 
S-9701EC-30 Placard 
ES39300-2 Control Knob  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-7   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
6.  REMOVAL, INSTALLATION / REPLACMENT OF WINDSHIELD DEFROSTER CONTROL 
VALVE. (Figure 6.7) 
REMOVAL 
A.  Remove defroster control valve knob and center console cover. 
B.  Disconnect bleed air plumbing from heater control valve. 
C.  Remove two mounting screws and remove defroster control valve.  
INSTALLATION / REPLACEMENT 
A. Position defroster control valve and connect bleed air plumbing. 
B. Install two mounting screws. 
C.  To ensure proper torque, align connection and thread B-Nut until metal on metal contact is 
felt.  Continue to tighten an additional 60 degrees of rotation and safety wire per step 1. 
D.  Install center console cover and defroster control valve knob. 
 
7.  REMOVAL, INSTALLATION /  REPLACEMENT OF HEATER TEMP SENSOR (Figure 3.8 & 
6.8) 
REMOVAL 
A.  Remove mounting hardware and wiring clamp if applicable.  Retain for installation. 
B.  Remove heater temp sensor wiring TSE connector and remove temp sensor. 
C.  Temp sensors 5 & 6 are part of the aft heater assembly and will necessitate removal of 
the heater assembly. 
INSTALLATION / REPLACEMENT 
NOTE 
Maintain a minimum clearance of 0.8 inches between temp sensors and 
bleed air plumbing.  Use fiber washers to isolate sensors. 
A.  Install temp sensor with mounting hardware and connect wiring with TSE connector. 
B.  Secure wiring in clamps as necessary. 
 
 
 
 
 
 
 
  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-8   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
 
 
 
 
 
 
 
8.  REMOVAL, CLEANING, INSTALLATION / REPLACEMENT OF DRAIN VALVE (Figure 3.7 & 
6.9)  
REMOVAL 
A.  Remove drain valve from ES49028-8/10 tee fitting. 
B.  Remove S-9230EC-11 plug, 2-009 O-ring, S-9230EC-12 ball, and S-9230EC-13 spring 
from drain valve body. 
C. Inspect O-ring for damage and ball and spring for corrosion.  Clean parts with non-
corrosive cleaning solution.  Replace as needed.  
 
INSTALLATION / REPLACEMENT 
A.  Assemble spring, ball, and O-ring into drain valve body. 
B.  Apply Loctite 567 (white) to internal threads of S-9230EC-11 plug.  Install plug and torque 
to 75 – 80 in/lb. 
C. Apply Anti-Seize Ease Off 990 (MB1215), or equivalent to drain valve threads.  Install 
drain valve into ES49028-8/10 tee fitting. 
  
Figure 6.8 ES52130-3 Temp Sensor 
(Typical)  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-9   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
 
 
 
 
 
 
 
 
9.  REMOVAL, INSTALLATION / REPLACEMENT OF THE BLEED AIR PLUMBING (Figure 3.1) 
REMOVAL 
A.  Cut attaching safety wire from B-Nuts at each end of bleed air plumbing to be removed. 
 
NOTE 
Always use a back-up wrench to hold the union, bulkhead fitting, or 
component that the bleed air plumbing is being removed from. 
 
B.  Loosen the B-Nut at each end of bleed air plumbing. 
C.  Remove any clamps securing bleed air plumbing to the aircraft. 
D.  Remove bleed air plumbing.  Apply protective caps as needed. 
  
Figure 6.9 S-9230EC-1 Drain Valve  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-10   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
INSTALLATION / REPLACEMENT 
A.  Install bleed air plumbing, secure clamps, and connect B-nuts. 
NOTE 
Always use a back-up wrench to hold the union, bulkhead fitting, or 
component that bleed air plumbing is being connected to. 
 
B.  Apply Anti-Seize Ease Off 990 (MB1215), or equivalent to all fittings prior to assembly. 
C.  To ensure proper torque, align connection and thread B-Nut until metal on metal contact is 
felt.  Continue to tighten an additional 60 degrees of rotation and safety wire per step 1. 
D. After completion of bleed air plumbing installation, check all joints for audible signs of 
leakage during operational run up of system. 
 
 
 
 
 
 
 
 
 
 
THIS AREA INTENTIONALLY LEFT BLANK 
  
						

							HEATER SERVICE MANUAL 407H-200M-1 
Revision C    Page 7-1       
 
 
Chapter 7 
TROUBLESHOOTING 
 
 
 
1.  SYSTEM TROUBLESHOOTING CHART 
 
Prior to troubleshooting a defective system, it is advisable to conduct a visual inspection for general 
condition, and obvious signs of damage or failure.  
 
The following matrix lists the easiest checks, and the most likely problems. 
 
Problem Probable Cause  Solution 
No Heat 
 
 Shutoff valve not open  Operate heater power switch to 
HEATER position 
No Heat 
 
 Heater control valve in the off 
position Operate heater control valve to the 
HEATER position 
No Heat 
 Shutoff valve failure  Replace shutoff valve 
No Heat 
 Heater circuit breaker tripped  Reset breaker 
No Heat. Heater OVER 
TEMP 
annunciator/indicator 
illuminated 
 
 Malfunction of temp sensor  Check temp sensor – all sensors 
should be electrically open 
No Heat /  Heater OVER 
TEMP 
annunciator/indicator 
illuminated 
 Air blockage of heater inlet or 
outlets Remove blockage 
No Heat /  Heater OVER 
TEMP 
annunciator/indicator 
illuminated 
 
 Bleed air line fitting loose 
causing an over-temperature 
condition Check all lines and fittings for 
security