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AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual
AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual
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HEATER SERVICE MANUAL 429H-201M-1 Revision 2 Page 3-13 Figure 3.11 Heater Control Panel (Aircraft right looking inboard)
HEATER SERVICE MANUAL 429H-201M-1 Revision 2 Page 3-13 Figure 3.12 Heater System Electrical Schematic
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page 3-14
This page intentionally left blank
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page 3-15
Heater System Control Valve Body
(View looking aft)
Heater System Control Valve Controls
(View looking down)
Figure 3.13 Heater System Control Valve
HEATER SERVICE MANUAL 429H-201M-1 Revision 0 Page 4-1 CHAPTER 4 PLACARDS AND MARKINGS Figure 4.1 Placards and Markings 429H-6620-33 ES39300-14 ES39300-12
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page 5-1
CHAPTER 5
SERVICING
1. SERVICING INFORMATION
No servicing required for the continued airworthiness of the 429 Heater System.
2. SUGGESTED SPARES LIST
Item
Description Part No.
1 Heater Shut Off Valve ES26192-1
2 Cockpit Heater Ejector 429H-6602-4
3 Cabin Heater Ejector Assy. FWD 429H-6610-1 Left Side
429H-6610-2 Right Side
4 Cabin Heater Ejector Assy. AFT 429H-6608-1 Right Side
429H-6608-2 Left Side
5 Defogger Ejector Assy. (older install) S-6406EC-4
6 Defogger Ejector Assy. (newer install) S-6406EC-6
7 Heater System Control Valve 429H-6670-2
8 Thermal Snap Switch S-8016EC-1
THIS AREA INTENTIONALLY LEFT BLANK
HEATER SERVICE MANUAL 429H-201M-1
Revision 3 Page 6-1
CHAPTER 6
STANDARD PRACTICES INFORMATION
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.
i. Cut safety wire with excess length.
ii. Thread through safety wire hole in B-nut (or fitting).
iii. Pull ends even. Twist safety wire to ensure a tight fit against the safety wire hole on the B-
nut (or fitting).
iv. Twist wire to achieve 8 to 12 twist per inch (2.5 cm).
v. Thread through safety wire hole in the next B-nut (or fitting). Ensure safety wire routing
prevents loosening of B-nuts.
vi. 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 COCKPIT HEATER EJECTOR ASSEMBLY
(See figure 3-7& 3-8).
REMOVAL
A. Disconnect the ejector B-Nut from the inlet tube.
B. Remove the AN526-6R6 screw from the side of the ejector body
C. Slide the ejector away from the outlet assembly to remove it from the aircraft.
INSTALLATION / REPLACEMENT
A. Slide the ejector into the outlet assembly.
B. Install the AN526-6R6 screw into the side of the ejector body.
C. 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.
HEATER SERVICE MANUAL 429H-201M-1 Revision 3 Page 6-4 CHAPTER 6 STANDARD PRACTICES INFORMATION (cont’d) 3. REMOVAL INSTALLATION / REPLACEMENT OF THE HEATER SHUTOFF VALVE (see figure 3.3). REMOVAL A. Gain access to the Main Rotor Transmission Cowling. B. Disconnect the bleed air plumbing from the Shutoff Valve. C. Disconnect the electrical connection to the valve. D. Remove the two MS27039C-1-15 mounting screws and remove the heater shutoff valve from the aircraft. INSTALLATION/REPLACEMENT A. Reinstall two MS27039C-1-15 mounting screws on the heater shutoff valve. B. Electrically connect the heater shutoff valve. C. Align the 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. D. Secure the Main Rotor Transmission Cowling. 4. REMOVAL INSTALLATION / REPLACMENT OF THE HEATER SYSTEM CONTROL VALVE. REMOVAL A. Remove the panel located under the Pilots and Co-pilots seats to gain access to the heater system control valve. B. Disconnect the bleed air plumbing from heater system control valve. C. Remove the valve control knobs. D. Remove two MS27039-0808 Screws, and remove the Valve from the aircraft. INSTALLATION / REPLACEMENT A. Install two MS27039-0808 screws and install the valve on the aircraft. B. Install the valve control knobs. C. Align bleed air plumbing connections 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.
HEATER SERVICE MANUAL 429H-201M-1 Revision 3 Page 6-4 CHAPTER 6 STANDARD PRACTICES INFORMATION (cont’d) 5. REMOVAL INSTALLATION / REPLACEMENT OF THE HEATER THERMAL SNAP SWITCHES REMOVAL A. Remove NAS1802-3-7 Bolt, MS21043-3 Nut, NAS1149CO316R Washer (qty 2) and MS21919WCH2 clamp. B. Remove M81824/1-1(qty 2) environmental splice. C. Remove S-8016EC-1 Thermal Snap Switch INSTALLATION / REPLACEMENT NOTE Maintain a minimum clearance of 0.8 inches between Snap Switch and Bleed Air Line NOTE See figure 3.10 for wire routing through the clamps. A. Connect S-8016EC-1 Thermal Snap Switch using M81824/1-1(qty 2) environmental splice. B. Install NAS1802-3-7 Bolt, MS21043-3 Nut, NAS1149CO316R Washer (qty 2) and MS21919WCH2 clamp per figure 3.10. 6. REMOVAL AND INSTALLATION / REPLACEMENT OF THE BLEED AIR PLUMBING REMOVAL A. Cut attaching safety wire from B-nuts at each end of the section 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 the Bleed Air Plumbing to be removed. C. Remove any clamps securing the Bleed Air Plumbing to the aircraft. D. Remove Bleed Air Plumbing from the aircraft.
HEATER SERVICE MANUAL 429H-201M-1 Revision 3 Page 6-4 CHAPTER 6 STANDARD PRACTICES INFORMATION (cont’d) INSTALLATION / REPLACEMENT NOTE Always use a back-up wrench to hold the union, bulkhead fitting, or component that the Bleed Air Plumbing is being connected to. A. 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. B. After completion of Bleed Air Plumbing installation, check all joints for audible signs of leakage during operational run up of system. Apply Torque Seal to all fittings. 7. REMOVAL AND INSTALLATION/REPLACEMENT OF ENGINE HEATER CHECK VALVES REMOVAL A. Cut attaching safety wire from B-nuts at each end of the section of the check valve 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 the check valve to be removed. C. Remove any clamps securing the check valve to the aircraft. D. Remove check valve from the aircraft. INSTALLATION / REPLACEMENT CAUTION Check valves must be installed with the words “INSTALL THIS SIDE UP” facing up. Ensure the “X” under the word “SIDE” is in the upmost position. A. Align check valve connections and thread B-Nuts until metal on metal contact is felt. Continue to tighten an additional 60 degrees of rotation and safety wire per step 1. B. Install any clamps removed during Step C of the removal procedure. C. After completion of check valve installation, check all joints for audible signs of leakage during operational run up of system. Apply Torque Seal to all fittings.