Instruction/ maintenance manual of the product MK XXII Honeywell
Go to page of 68
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 1 of 68 MK V MK VI MK VII MK VIII MK XXII Enhanced Ground Proximity Warning Systems Line Maintenance Manual Document No: 060-4199-180, Rev G Release date: 29 Mar 2010 Honeywell International, Inc.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 2 of 68 This document is an unpublished w ork. Copyright 2005, 2010 Honey w ell International, Inc.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 3 of 68 REVISIONS SHT RE V DESCRIPTION DATE A PPROVED All Initial release. Reason 01 Severity 10 23 FEB 00 23 FEB 00 R. Halbert G. Gilliland All A Direct update: Incorporate –008 changes Reason 01 Severity 10 07 AUG 01 07 AUG 01 R.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 4 of 68 REVISIONS SHT RE V DESCRIPTION DATE A PPROVED All E Section 3.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 5 of 68 TABLE OF CONTENTS 1 INTRODUCT ION............................................................................................................
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 6 of 68 3.8.3 +28V Landing Gear Discr ete ..................................................................................................... .....
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 7 of 68 5.1 G ENERAL ................................................................................................................................
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 8 of 68 1 INTRODUCTION 1.1 SCOPE This document provides information about the Enhanced Gr ound Proximity Warning System (EGPWS) with respect to Line Maintenance Operations.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 9 of 68 MK V & MK VII EGPWC (left) and MK VI, MK VIII, MK XXII EGPWC (right) Figure 1-1 - Enhanced Ground Proximity Warning Computers 1.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 10 of 68 2 DESCRIPTION AND OPERATION 2.1 GENERAL SYSTEM DESCRIPTION The purpose for the Enhanced Ground Proximity Warning Syst em (EGPWS) is to help pr event accidents caused by Controlled Flight Into Terrain (CFIT), obstacles, or severe windshear.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 11 of 68 2.1.1 ENHANCED GROUND PROXIMITY WARNING COMPUTER (EGPWC) All EGPWS functions are processed by a single Line Replaceable Unit (LRU) called the Enhanced Ground Proximity Warning Computer (EGPWC).
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 12 of 68 provides “TOO LOW TERRAIN” or “TOO LOW FLAPS” depending on airspeed. Mode 4C provides “TOO LOW TERRAIN”. EGPWS alert lights ar e illuminated during these alerts.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 13 of 68 MODEL CALLOUT DESCRIPTION V VI VII VIII XXII 500 TONE Provides 2 second 960 Hz tone at de.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 14 of 68 2.2.6.1 EXCESSIVE BANK ANGLE CALLOUT The Bank Angle Callout feature pr ovides callout enunciation for excessive bank angles based on altitude and bank angle limits defined by aircraft type.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 15 of 68 When an aircraft penetrates either the TCF or the RFCF alert envelope, the aural message “TOO LOW TERRAIN” will occur.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 16 of 68 The Obstacle Database (in MK V and MK VII -204-204 and late r, and MK VI, MK VIII and MK XXII) is a separate file included within the terrain database.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 17 of 68 below the antenna beam scan resulting in a blank display. Alternately, under-scan, where the antennas scan is hitting the ground below the weather cells, results in ground cl utter display.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 18 of 68 installation does require that the EGPWS has a source of GPS data, software -230-230 or later, Terrain Database version 454 or later, and the Reloadable Customer Defini tions (RCD) is loaded.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 19 of 68 2.2.21 LAMP FORMAT The EGPWS contains two different caution/warn ing lamp illumination formats as described below.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 20 of 68 2.3 SYSTEM MAINTENANCE 2.3.1 MAINTENANCE PHILOSOPHY The EGPWS is an “on-condition” only maintenance system . No scheduled maintenance is required.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 21 of 68 These tests primarily consist of more thorough hardware checks that would di srupt normal operation if continuously run.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 22 of 68 2.3.5 SELF-TEST FUNCTIONS The EGPWC supports a manually operated Se lf-Test sequence for indicating the oper ational status of the system.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 23 of 68 3 FAULT ISOLATION (TROUBLESHOOTING) 3.1 GENERAL The troubleshooting methods provided in this section identify system and sensor or subsys tem faults to the lowest level possible.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 24 of 68 3.3 LEVEL 1 SELF-TEST - GO/NO GO TEST Level 1 Self-Test provides an overview of the current operational capability of the EGPWS.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 25 of 68 POSSIBLE SELF-TEST PREAMBLE RESULTS Enunciation: “CONFIGURATION MODULE NOT PROGRAMMED” (MK VI, MK VIII, MK XXII only) Probable Cause: The Configuration Module is not programmed.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 26 of 68 Installations that do not have the windshear function or the function enabled will not enunciate the windshear message and illuminate windshear alert lights.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 27 of 68 3.4.1 CURRENT FAULTS - INTERNAL An internal fault indicates a problem with the EGPWC. The following table lists the internal fault messages and the probable maintenance response.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 28 of 68 TABLE 3-3: CURRENT FA ULTS - EXTERNAL (EXAMPLES) FAULT EXAMPLE REASON ARINC 429 Bus Fault.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 29 of 68 TABLE 3-4: LEVEL 2 SELF-TEST - EXTERNA L FAULTS THE FOLLOWING EXTERNAL FAULTS ARE AVAILAB.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 30 of 68 THE FOLLOWING EXTERNAL FAULTS ARE AVAILABLE IN LEVEL 2 SELF-TEST: Description: SELF-TEST INVALID (WinVIEWS ONLY) Probable Cause: Electrical s hort at the Self-Test input.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 31 of 68 TABLE 3-5: GENERA L FAILURE CODE IDENTIFIERS For example, if the Computed Airspeed from Air Data Com puter #1 is failed (i.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 32 of 68 NOTE : Before attempting to correct an external fault, verify that the EGPWS installation configuration matches the aircraft configuration.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 33 of 68 3.5 LEVEL 3 SELF-TEST - SYSTEM CONFIGURATION A Level 3 Self-Test enunciates EGPWC configuration information.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 34 of 68 THE FOLLOWING INFORMATION IS GI VEN IN THE LEVEL 3 SELF-TEST: “IRS 1 ATTITUDE MODE SELECTED” “ MODE 6 INOP-NO Decision Height” (approaching minimums in menu).
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 35 of 68 THE FOLLOWING INFORMATION IS GI VEN IN THE LEVEL 3 SELF-TEST: “GPS ALTITUDE REF WGS84 S.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 36 of 68 3.6 LEVEL 4 SELF-TEST - FAULT HISTORY Level 4 Self-Test provides enunciation of t he faults recorded over the last 10 flight legs.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 37 of 68 3.7 LEVEL 5 SELF-TEST - ALERT HISTORY Level 5 Self-Test provides enunciation of the alerts (cautions and warnings) reco rded over the last 10 flight legs.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 38 of 68 3.8.1 ARINC 552 / ALT 55 RADIO ALTIT UDE VALIDITY FLAG DISCRETES Three Radio Altitude validity flags may be used by the EGPWS, one for each of the three possible ARINC 552 or ALT 55 Radio Altimeters inputs.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 39 of 68 3.8.4 GND LANDING FLAP DIS CRETE OR FLAP OVERRIDE Type: Supplied by Flap or Flap selector handle switch. This input can be paralleled with, or used exclusively by a Flap Override Switch if an alternate source of Flap Position is used.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 40 of 68 3.8.6 FLAP POSITION DISCRETES Up to four flap position discretes are typically supplied from the flap selector handle switch. Type: Supplied by Flap selector handle switch.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 41 of 68 3.8.8.2 STEEP APPROACH DISCRETE #2 Type: Steep Approach Selected Signal Status: Steep App.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 42 of 68 3.8.12 GND GLIDESLOPE INHIBIT DISCRETE Type: Switch for inhibit of Glideslope mode Signal.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 43 of 68 3.8.16 MODE 6 VOLUME CONTROL DISCRETE Type: Mode 6 low volume select switch Signal Status: Low Volume Select or Normal Volume “Low Volume” in this case refers to the -6db volume level used during Self-Tes t.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 44 of 68 3.8.20 AOA VALIDITY DISCRETES (MK V AND MK VII ONLY) Two AOA validity discretes may be used by EGPWS, one for each source of AOA.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 45 of 68 3.8.24 WEATHER RADAR ON/OFF Type: WXR On/Off switch input Signal Status: Radar turned on .
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 46 of 68 3.8.28 BAROMETRIC ALTITUDE RATE VALIDITY DISCRETES Two Barometric Altitude Rate validit y discretes may be used by EGPWS, one for each possible barometric rate sensor.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 47 of 68 3.8.33 MAGNETIC HEADING VALIDITY DISCRETE A Magnetic Heading validity discrete may be used by EGPWS for the Magnetic Heading sensor. Type: Validity from Magnetic Heading sensor.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 48 of 68 3.8.37 TACTICAL SELECT DISCRETE Tactical Select discrete may be used by EGPWS for an indica tion that the Tactical Select switch has been pressed.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 49 of 68 3.8.41 WEIGHT ON WHEELS DISCRETE Weight On Wheels Discrete may be used by EGPWS to determine if the aircraft is on the ground.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 50 of 68 3.8.45 STABILIZED APPROACH MONITOR ENABLE DISCRETE (MK V AND MK VII ONLY) Type: Discrete .
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 51 of 68 4 MAINTENANCE PRACTICES 4.1 GENERAL Normal maintenance activities performed on the EGPWS should follow standard industry maintenance practices.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 52 of 68 The database may be loaded either while the EGPWC is on the aircraft or on a bench provided the appropriate power is applied.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 53 of 68 NOTE: This operation should require no more than 10 minutes. NOTE : If the XFER FAIL LED turns ON instead of the XFER COMP LED, then a different Flight History Download PCMCIA Card must be obtained from Honeywell for the Data Download.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 54 of 68 4.4 PROGRAMMING THE CONFIGURATION MO DULE (MK VI, MK V III, MK XXII ONLY) Programming the EGPWS Configuration Module is acco mplished using WinVIEWS on a PC connected to the EGPWC via the RS-232 interface.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 55 of 68 4.4.1 CONFIGURATION MODULE REPROGRAMMI NG (MK VI, MK V III, MK XXII ONLY) Reprogramming the EGPWS Configuration Module is acco mplished similar to the programming process above.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 56 of 68 An example CUW command/data string, its definition, and the corresponding CWR list is provided below.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 57 of 68 5 SERVICING 5.1 GENERAL The EGPWS does not require any servicing. 6 REMOVAL/INSTALLATION 6.1 EGPWC 6.1.1 REMOVAL 1. Remove power to the EGPWC.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 58 of 68 4. Align the Configuration Module housing to the P2 c onnector ensuring that wires are properly contained within the connector assembly. 5. Install the two screws securing the C onfiguration Module to the P2 connector.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 59 of 68 8 INSPECTION/CHECK 8.1 GENERAL The EGPWS does not require any specif ic periodic inspection or checks. The system should be inspected for integrity and checked for wear/tear during the cour se of routine aircraft maintenance inspections.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 60 of 68 11 APPENDIX A: WINVIEWS WinVIEWS (Win dows V irtual I nterface to the E nhanced W arning S ystem) is a software tool developed by Honeywell to monitor or view values within the EGPWC, and perform certain test interface functions.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 61 of 68 12 APPENDIX B: TROUBLESHOOTING DO’S AND DO NOT’S DO use built-in self test levels to find the exact nature of the fault.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 62 of 68 13 APPENDIX C: RAAS MAINTENANCE MESSAGES (AURAL & DISPLAYED) TABLE C1-1: RA AS MA INTENANCE MESSA GES MAINT.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 63 of 68 TABLE C1-2: RA AS DISPLA YED MAINTENA NCE MESSA GES MAINT. FUNCTION DISPLAYED MESSAGE RAAS Display messages are displayed On- Ground only. To initiate, change the display range.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 64 of 68 14 APPENDIX D: STABILIZED APPRO ACH MONITOR MAINTENANCE MESSAGES TABLE D-1: STA BILIZED APPROA CH MONITOR MA INTENANCE MESSA GES MAINT.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 65 of 68 15 APPENDIX E: ALTIMETER MO NITOR MAINTENANCE MESSAGES TABLE E-1: A LTIMETER MONITOR MAINTENA NCE MESSAG ES MAINT.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 66 of 68 16 APPENDIX F: TAKEOFF FLAP CO NFIGURATION MONITOR MAINTENANCE MESSAGES TABLE F-1: TA KEOFF FLAP CONFIGURA TION MONITOR MA INTENANCE MESSA GES MAINT.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 67 of 68 17 APPENDIX G: LONG LANDING MONITOR MAINTENANCE MESSAGES TABLE G -1: LONG LA NDING MONITOR MA INTENANCE MESSA GES MAINT.
EGPWS LINE MAINTENANCE MANUAL CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 68 of 68 18 APPENDIX H: LOW AIRSPEED MONITOR MAINTENANCE MESSAGES TABLE H-1: LO W AIRSPEED MONITOR MA INTENANCE MESSA GES MAINT.
An important point after buying a device Honeywell MK XXII (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell MK XXII yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell MK XXII - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell MK XXII you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell MK XXII will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell MK XXII, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell MK XXII.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell MK XXII. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell MK XXII along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
