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...

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...

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...

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...

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...

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...

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...

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...