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 
Valve 
Heater 
Circuit 
Breaker 
Fwd Flow Control 
Heater Ejector 
Outlets 
Figure 4.1 Placards and Markings 
Aft Heater 
Assembly Flow 
Control Knob  
						

							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 safety wire to ensure a tight fit against the safety wire hole on the 
B-nut (or fitting). 
d. Twist wire to achieve 8 to 12 twist per inch (2.5 cm). 
e. Thread through safety wire hole in the next B-nut (or fitting).  Ensure safety wire routing 
prevents loosening of B-nuts.  
f. Twist wire again to achieve 8 to 12 twists per inch (2.5 cm).  Cut to form a “pigtail” with a 
minimum of 4 twists. 
 
2.  REMOVAL, INSTALLATION / REPLACEMENT OF FWD HEATER EJECTOR ASSEMBLY 
(Figure 6.1 - 6.3) 
REMOVAL 
A.  Disconnect ejector inlet tube B-Nut from bleed air plumbing. 
B.  Slide ejector into adapter to unhook ejector link from air outlet pin.  Slide ejector away 
from adapter for removal. 
INSTALLATION / REPLACEMENT 
A.  Slide ejector into adapter to hook ejector link to air outlet pin.  Slide ejector back from 
adapter enough to position it for connection to bleed air plumbing. 
B.  Connect ejector inlet tube B-Nut to bleed air plumbing.  
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 
paragraph 1. 
 
   
						

							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 Forward Flow Control Heater Ejector Outlet 
(Looking Aft) 
Ejector Inlet Tube
bleed air plumbing. to position to connect ejector to  to air outlet pin. Slide ejector back Adapter so 
that link can be hooked Slide ejector into S-9704EC-1
ES72182-2 Air Outlet
Ejector Control Hook
Pin - Part of Air Outlet
 - Part of Ejector Link - Ejector Control
DO NOT TORQUE TIGHTEN NUTS UNTIL SNUG 
						

							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