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

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                             Page 3-11   
 
 
Figure 3.10 Heater System Temp Sensors 
Heater Power Switch
 
Caution Light Assy (STD)  
Over temp Indicator (GX)
 
  

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                             Page 3-12 
 
 
  
View A – A (pg 3-10) 
Figure 3.11 Heater Overtemp Indicator (GX)  

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                             Page 3-13 
 
 
 
 
 
 
View A – A (pg 3-9) 
Figure 3.12 Existing Overtemp Annunciator (STD) 
View B – B (pg 3-9) 
Figure 3.13 Heater Power Switch 
Heater Power  
Switch  

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                             Page 3-14   
 
 
Figure 3.14 Heater System Electrical Schematic (STD)  

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                             Page 3-15 
 
Figure 3.15 Heater System Electrical Schematic (GX)  

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                               Page 4-1 
 
Chapter 4 
PLACARDS AND MARKINGS 
 
1.  Heater System Placards and Markings 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FULL
ON
DEFROSTEROFF
ON
HTR
OVER
TEMP
HEATER
ON
TEMP
CABIN HEATER
AIR COMM CORPORATION
OFFFULL
ON
ROTATE
FLOW CONTROL
Defroster Control 
Valve Knob 
Overtemp 
Lens 
Optional 
Light  
Heater Control...

HEATER SERVICE MANUAL 407H-200M-1 
Revision C                                                                                                               Page 5-1   
Chapter 5 
SERVICING 
 
1. Servicing Requirements 
 
No servicing is required for the cabin heating system. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
THIS AREA INTENTIONALLY LEFT BLANK 
  

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-1  Chapter 6 
STANDARD PRACTICES 
 
1.  B-NUT / FITTING SAFETY WIRE PROCEDURE 
A.  Use MS20995C-32 per QQ-W-423B Cond A safety wire (or Equivalent) to secure all B-nut 
/ Fittings in the heater bleed air system. 
a. Cut safety wire with excess length. 
b. Thread through safety wire hole in B-nut (or fitting). 
c. Pull ends even. Twist...

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-2   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
S-9701EC-36 Placard
ROTATEFLOW CONTROL
Ejector Link Hook ES72182-2 Air Outlet
Ejector Inlet Tube
Figure 6.1 Forward Flow Control Heater Ejector Outlet Detail 
(Looking Down) 
View A – A (pg 6-3) 
Figure 6.2...

HEATER SERVICE MANUAL 407H-200M-1 
Revision D                                                                                                                      Page 6-3   
Chapter 6 
STANDARD PRACTICES (Continued) 
 
 
 
 
 
 
Figure 6.3 Heater System Forward and Aft Ejectors 
(Looking Down) 
FWD Ejector Assembly