Home
>
AirComm Corporation
>
Heater
>
AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual
AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual
Have a look at the manual AirComm Corporation Bell 429 Heating System 429H201M1 Rev3 User Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 74 AirComm Corporation manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
HEATER SERVICE MANUAL 429H-201M-1 Revision 3 29 December 2011 AIR COMM CORPORATION 3330 AIRPORT ROAD BOULDER, CO. 80301 Phone: (303) 440-4075 Fax: (303) 440-6355 [email protected] INSTRUCTIONS FOR CONTINUED AIRWORTHINESS BELL HELICOPTER 429 HEATER SYSTEM
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page i
REVISION
NUMBER ISSUE
DATE DATE
INSERTED BY
1 10/09/09 10/09/09 MJS
2 11/11/11 11/11/11 MJS
3 12/29/11 12/29/11 MJS
REVISION
NUMBER ISSUE
DATE DATE
INSERTED BY
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page iii
LIST OF REVISIONS
Rev Description Date
0 (Original Issue) 4/6/2009
1 Added STC number, weight and balance information and minor corrections. 10/09/2009
2 Updated part numbers, minor corrections in Chapters 0, 2, 3, 5, 6 and 7. 11/11/2011
3 Expanded content in Chapter 6 to include installation steps. 12/29/2011
LIST OF EFFECTIVE PAGES
Title Page(s) Revision No.
Record of Revisions i 2
List of Revisions ii 2
List of Effective Pages ii 2
Table of Contents iii 2
Chapter 0 Introduction 0-1 to 0-3 2
Chapter 1 Airworthiness Limitation Section 1-1 0
Chapter 2 Inspections 2-1 2
Chapter 3 Location and Access 3-1 to 3-15 2
Chapter 4 Placards and Markings 4-1 0
Chapter 5 Servicing 5-1 2
Chapter 6 Standard Practices 6-1 to 6-4 3
Chapter 7 Troubleshooting 7-1 2
Appendix A Weight and Balance Information A-1 1
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page iii
TABLE OF CONTENTS
Identification Title Page
CHAPTER 0 INTRODUCTION
1. Scope 0-1
2. Purpose 0-1
3. Arrangement 0-1
4. Applicability 0-1
5. Definitions 0-1
6. Abbreviations 0-1
7. Precautions 0-1
8. Units of Measurement 0-2
9. Information Essential to the Continued Airworthiness 0-2
of the Heater System
10. Reference Document 0-2
11. Distribution 0-2
12. Changes to Instructions for Continued Airworthiness 0-2
13. Heater System Description and Operation 0-3
CHAPTER 1 AIRWORTHINESS LIMITATION
1. Airworthiness Limitations. 1-1
CHAPTER 2 INSPECTIONS
1. Inspection Requirements 2-1
CHAPTER 3 LOCATION AND ACCESS
1. Location of Heater Features 3-1
Figure 3.1 Cabin Heater General Arrangement 3-2
Figure 3.2 Cabin Heater General Arrangement (continued) 3-3
Figure 3.3 Engine Component Bleed Air Plumbing 3-4
Figure 3.4 Bleed Air Plumbing Schematic– Firewall Shutoff Valve to Heater
System Control Valve 3-5
Figure 3.5 Bleed Air Plumbing Schematic– Heater Control Valve to Heater
Ejectors 3-6
Figure 3.6 Plumbing Schematic– Defogger 3-7
Figure 3.7 Forward Crew Heater Ejectors 3-8
Figure 3.8 Heater Ejector Installation 3-9
Figure 3.9 Windshield Defog System and Defog Ejectors 3-10
Figure 3.10 Cabin Heater System Thermal Snap Switches 3-11
Figure 3.11 Heater Control Panel 3-12
Figure 3.12 Heater System Electrical Schematic 3-13
Figure 3.13 Heater System Control Valve 3-15
CHAPTER 4 PLACARDS AND MARKINGS
1. Placards and Markings 4-1
CHAPTER 5 SERVICING
1. Servicing Information 5-1
2. Suggested Spares List
CHAPTER 6 STANDARD PRACTICES INFORMATION
1. B-Nut / Fitting Safety Wire Procedure 6-1
2. Removal, Installation/Replacement of Cockpit Heater Ejector Assy. 6-1
3. Removal, Installation/Replacement of Heater Shutoff Valve 6-2
4. Removal, Installation/Replacement of Heater Control/Defroster Valve 6-2
5. Removal, Installation/Replacement of Heater Temperature Sensor 6-2
6. Removal, Installation/Replacement of Bleed Air Plumbing 6-3
7. Removal, Installation/Replacement of Thermal Snap Switches 6-3
CHAPTER 7 TROUBLESHOOTING
1. System Troubleshooting 7-1
APPENDIX A Weight and Balance Information A-1
HEATER SERVICE MANUAL 429H-201M-1
Revision 2 Page 0-1
CHAPTER 0
INTRODUCTION
1. SCOPE
The scope of this manual encompasses the scheduled and unscheduled maintenance procedures
for the continued airworthiness of the Air Comm Corporation heater system installed in the Bell 429
helicopter.
2. PURPOSE
The purpose of this manual is to provide the aircraft mechanic in the field the necessary information
to maintain the heater system.
3. ARRANGEMENT
This manual is arranged by chapters which are broken down into paragraphs and sub-paragraphs.
All of the chapters and paragraphs are listed in the front of this manual in the Table of Contents, and
are further identified by their individual page number.
4. APPLICABILITY
This manual is applicable to Bell Helicopter models 429 that are equipped with the Air Comm
Corporation kit number 429H-201 heater system.
5. DEFINITIONS
The following terms are provided to give a ready reference to the meaning of some of the words
contained within this manual. These definitions may differ from those given by a standard dictionary.
Outside Ambient Air Temperature (OAT): The temperature of the air surrounding a person or
object outside the helicopter.
Inside Ambient Air Temperature (IAT): The temperature of the air as measured at the inlets of the
heater system.
6. ABBREVIATIONS
ADIU: Air Data Integration Unit
cm: Centimeters
Lbs: Pounds
LH: Left hand
OEI: One Engine Inoperative
OVRD: Override
RH: Right hand
7. PRECAUTIONS
The following precautions may be found throughout this manual, and will vary depending on the
seriousness of the Hazard or Condition:
WARNING: May be a maintenance procedure, practice, condition, etc., which could result in
personal injury or loss of life.
CAUTION: May be a maintenance procedure, practice, condition, etc., which could result in
damage or destruction of equipment.
NOTE: May be a maintenance procedure, practice, condition, etc., or a statement which
needs to be highlighted.
HEATER SERVICE MANUAL 429H-201M-1 Revision 2 Page 0-3 8. UNITS OF MEASUREMENT All measurements contained within this manual are given in the United States standard measurement, followed by the metric conversion in parentheses. 9. INFORMATION ESSENTIAL TO THE CONTINUED AIRWORTHINESS OF THE HEATER SYSTEM. This manual provides information which is required for operation and maintenance of the Air Comm heater system installed in the Bell model 429 series helicopter. After completion of the heater installation this document must be placed with the appropriate existing aircraft documents. 10. REFERENCE DOCUMENT The approval basis of the system covered by this ICA is Supplemental Type Certificate SR00692DE. 11. DISTRIBUTION This document is to be placed with the aircraft maintenance records at the time of system installation Changes will be made to this document in response to “Safety of Flight”, and or “Non-safety of Flight” issues. Any changes will result in a revision to this document. Revisions shall be noted in the Record of Revisions (page i), and on the List of Revisions (page ii) of this manual. In addition to the revision of the manual, those changes categorized as “Safety of Flight” shall have a Service Bulletin issued to the operator providing the necessary information to comply with, and or to correct, the “Safety of Flight” issue. Replacement, and or revised copies of this manual may be acquired by contacting: Air Comm Corporation Service Department 3330 Airport Road Boulder, CO.80301 Phone No. 303-440-4075 Fax No. 303-440-6355 [email protected] 12. CHANGES TO INSTRUCTIONS FOR CONTINUED AIRWORTHINESS Changes made to a line or paragraph of this document will be indicated by a vertical bar in the right hand margin, while a complete page change will be indicated by a vertical bar next to the page number. (Example: Any changes will appear with a vertical bar next to that change).
HEATER SERVICE MANUAL 429H-201M-1 Revision 2 Page 0-2 13. HEATER SYSTEM DESCRIPTION AND OPERATION The cabin heater system is a bleed air type, which incorporates the mini ejector concept as shown by the General Arrangement drawing (figure 3.1 and 3.2). The heater plumbing extends from the aft engine firewall forward across the cabin roof, and down the RH door post were it branches out under the pilots seats to supply heat to all the system ejectors, as well as the windshield defrosters. The system consists of a series of small heater ejector assemblies which are located forward of the anti-torque pedals, below the cabin floor, and in the fuselage side panels. Two additional ejectors are included to provide warm air for windshield defogging. The heater ejectors mix engine bleed air with re-circulated cabin air and exhausts warm air to the floor area of the cabin. The air circulation through the ejector is achieved by the bleed air pressure. NOTE Operation of the cabin heater above 70o F (21o C) ambient may result in excessive outlet temperature. The heater and defogger systems are manually controlled by a single, crew operated valve. (see figure 3.13). The system control valve is located on the lower forward left hand side of the pilot’s seat box. The valve is manually controlled by two bleed air flow control knobs. One knob controls flow of bleed air to the heater ejectors and the other controls flow to the defog ejectors. The knobs can be adjusted individually as required to maintain desired cabin temperature and a clear field of view. The heater system is electrically controlled by the heater control switch. This switch is located on the overhead control panel and consists of three positions: “ON”, “OFF” and “OVRD.” With the heater control switch in the “ON” position, power is supplied to the shutoff valve as long as all the snap switches are closed to ground and both engines are operational. With the heater control switch in the “OFF” position, there is no power supplied to the normally closed valve, thus no bleed air is supplied to the heater. With the heater control switch in the “OVRD” position, power is supplied to the shutoff valve regardless of snap switch position. The use of the “OVRD” position is for emergency defogging while experiencing an One Engine Inoperative (OEI) condition. Bleed air flow from the engines is controlled by a solenoid operated firewall mounted ON-OFF valve. Bleed air for the heater is taken from the bleed air ports from each engine and combined thru a fitting located on the firewall. The line then goes forward to the system shutoff valve. The system shutoff valve is an electrically operated, normally closed ON-OFF valve, and must be turned ON to operate the system by selecting the HEATER position of the HEATER-OFF-OVRD switch located in the overhead switch panel (figure 3.11). The power for the system shutoff valve is supplied from the emergency bus. A relay contained in the heater installation, directs power to the heater shutoff valve in the “ON” position. In the event of a OEI condition, the relay will direct power to the “OVRD” side of the heater control switch. The shutoff valve will remain open as long as all the snap switches are closed to ground. System defogging can be utilized in an OEI condition by placing the control switch in the “OVRD” position. (See Flight Manual Supplement for complete OEI procedures). A series of snap switch temperature sensors are installed along the bleed air line routing. These sensors are designed to electrically disconnect the firewall shut-off valve in case of an excessive increase in temperature. These normally closed switches open when the switch temperature exceeds 180°F. When any of these switches open, the “Heater Duct Hot” is illuminated on the Air Data Integration Unit (ADIU) panel. The heater shutoff valve power is also removed, thus closing the flow of bleed air automatically. The shutoff valve will stay closed and the “Heater Duct Hot” will stay illuminated until the Heater Control Switch is moved to the “OFF” position. The heater can be re- engaged only if all snap switches are closed (below 180°F).
HEATER SERVICE MANUAL 429H-201M-1
Revision 0 Page 1-1
CHAPTER 1
AIRWORTHINESS LIMITATION
The Airworthiness Limitations section is FAA approved and specifies inspections and other
maintenance required under §§43.16 and 91.403 of the Federal Aviation Regulations
unless an alternative program has been FAA approved.
1. AIRWORTHINESS LIMITATIONS
None
THIS AREA INTENTIONALLY LEFT BLANK
HEATER SERVICE MANUAL 429H-201M-1
Revision 1 Page 2-1
CHAPTER 2
INSPECTIONS
1. INSPECTION REQUIREMENTS
PERIODIC INSPECTIONS
NOTE
The 429 provisions kits do not require periodic inspection until the 429 component kits have
been installed.
See Appendix A for a complete list of provision and component drawings.
Item Annually
Prior to Heating Season Special Inspection Information Ref. Figure
Heater System
Control Valve X Check for ease of mechanical operation and
security. Check placard installation for security. 3.13
Bleed Air
Plumbing X Check for security and evidence of air leaks around
fittings. 3.1 - 3.3
Heater Ejectors
Defog Ejectors X Check for evidence of air leaks and corrosion around
bleed air connection, and security. 3.5 - 3.9
Placards &
Markings X Check for security and legibility. 4.1
Shutoff Valve X Conduct functional check during ground operation.
Functional Check
1. Ensure heater control switch is in the OFF
position.
2. With aircraft engines running ensure there is no
airflow to the heater ejectors.
3. Place the heater control switch to the ON position.
4. Check for warm air at each of the air ejectors.
5. Return switch to the OFF position. 3.3
3.4
3.12
HEATER SERVICE MANUAL 429H-201M-1 Revision 2 Page 3-2 CHAPTER 3 LOCATION AND ACCESS 1. LOCATION OF HEATER FEATURES Nomenclature Figure Description of Location Cabin Heater General Arrangement 3.1 System overview Cabin Heater General Arrangement 3.2 System overview Engine Compartment Bleed Air Plumbing (Engines to Firewall Shutoff Valve) 3.3 Cabin roof Bleed Air Plumbing – Firewall Shutoff Valve to Heater System Control Valve 3.4 Cabin ceiling, RH door post and floor. Bleed Air Plumbing – Heater System Control Valve to Heater Ejectors 3.5 Under floor and center console Bleed Air Plumbing - Defogger 3.6 Center console to instrument panel bulkhead Forward Crew Heater Ejectors 3.7 Forward crew compartment near control pedals Heater Ejector Installation 3.8 Under floor and near baggage compartment Windshield Defog System and Defog Ejectors 3.9 In front of instrument panel and below floor Cabin Heater System Thermal Snap Switches 3.10 Various locations near heater plumbing Heater Control Panel 3.11 Aft end of center console Heater System Electrical Schematic 3.12 For reference only Heater System Control Valve 3.13 Under floor at aft end of center console.