Honeywell MK VIII Enhanced Ground Proximity Warning Computer Egpwc, Mode 3 Descent After Takeoff

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EGPWS LINE MAINTENANCE MANUAL

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).

The MK V and MK VII EGPWC are digitally controlled computers housed in a 2 MCU ARINC 600-6 form factor chassis intended for Air Transport type aircraft. Installation configuration is defined by program pin strapping in the aircraft.

The MK VI and MK VIII EGPWC are digitally controlled computers housed in a non-ARINC form factor chassis intended for Business and General Aviation and Regional Turboprop type aircraft. These models have fewer interface and functional options. The installation configuration is defined in a programmed Configuration Module installed in the aircraft.

The MK XXII EGPWC is a digitally controlled computer housed in a non-ARINC form factor chassis intended for various rotorcraft. Similar to the MK VI and MK VIII EGPWC, this model has fewer interface and functional options. The installation configuration is defined in a programmed Configuration Module installed in the helicopter.

The EGPWC receives information in AC, DC, discrete, and synchro analog formats, and RS-232, RS-422, ARINC 429 or ARINC 575 digital formats. Discrete signals can be either ground or +28V discretes. The EGPWC provides discrete, audio and ARINC 429 outputs for alerts and system status, and video (ARINC 453/708) for terrain display. The EGPWC is rack mounted and does not require any forced air cooling when operated within the normal operating temperature range given in the Table 1-1.

2.2 OPERATION

2.2.1 MODE 1 – EXCESSIVE DESCENT RATE

Mode 1 provides audio and visual alerts for excessive descent rates into terrain. When the EGPWS caution alert envelope is penetrated, the message “SINKRATE” is enunciated and EGPWS alert lights illuminate. Continuing the excessive descent rate into the EGPWS warning alert envelope results in a “PULL-UP” enunciation and EGPWS alert lights illuminated. Mode 1 is desensitized to eliminate unwanted (nuisance) alerts when the EGPWS determines that the aircraft is above a Glideslope beam. In some fixed-wing applications, Mode 1 is also desensitized when Steep Approach or Flap Override is active. In helicopter applications, Mode 1 is disabled when autorotation is detected.

2.2.2 MODE 2A/2B - TERRAIN CLOSURE RATE

Mode 2 provides audio and visual alerts for dangerously high terrain closure rates. Two sub-modes, referred to as Mode 2A and 2B, are defined. Mode 2A is active when flaps are not in the landing position and the aircraft is not on an ILS approach within ± 2 dots of glideslope center. Mode 2B is active when the flaps are in the landing position or while on an ILS approach within ± 2 dots of glideslope deviation. When the caution alert envelope is penetrated, the message “TERRAIN, TERRAIN” is enunciated and EGPWS alert lights illuminate. Continuing the high terrain closure rate into the warning alert envelope results in a “PULL-UP” enunciation and EGPWS alert lights illuminated.

2.2.3 MODE 3 - DESCENT AFTER TAKEOFF

Mode 3 provides audio and visual alerts for excessive altitude loss after takeoff, or after a go-around from below 245 feet above ground level (AGL), when flaps and gear are not in the landing configuration. Penetrating the Mode 3 alert envelope causes the voice message “DON’T SINK, DON’T SINK” and illumination of EGPWS alert lights.

2.2.4 MODE 4A/4B/4C - UNSAFE TERRAIN CLEARANCE

Mode 4 provides audio and visual alerts for unsafe terrain clearance with respect to phase of flight, height above ground, and speed. Three sub-modes, referred to as Mode 4A, 4B, and 4C, are defined. Mode 4A is active during cruise and approach with landing gear up. Mode 4B is active during cruise and approach with landing gear down and flaps up. Mode 4C is active during takeoff when either gear or flaps are not in the landing configuration. The aural enunciations for Mode 4A are “TOO LOW TERRAIN” or “TOO LOW GEAR” depending on airspeed. Mode 4B

CAGE CODE: 97896

SCALE: NONE SIZE: A DWG NO.: 060-4199-180

REV: G

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Contents Egpws Line Maintenance Manual Drawn Approved RevisionsDescription DateEFF PT 14A Disp USE Table of Contents Maintenance Practices 10.1 MK V Egpwc Part Numbers MK VII Egpwc Part Numbers Introduction ScopeApplicability MK VI, MK VIII, MK Reference DocumentsEnhanced Ground Proximity Warning System Description and Operation General System DescriptionMode 4A/4B/4C Unsafe Terrain Clearance Operation Mode 1 Excessive Descent RateMode 2A/2B Terrain Closure Rate Mode 3 Descent After TakeoffCallout Description Mode 5 Descent below GlideslopeMode 6 Advisory Callouts Optional Smart Five Hundred Envelope Modulation not Available in MK VI/VIII Mode 7 Windshear Detection Optional for MK V/VII onlyExcessive Bank Angle Callout Tail Strike CalloutTerrain and Obstacle Database Runway DatabaseTerrain Alerting and Display Optional Weather Radar Autotilt MK V and MK VII only Peaks Display Mode OptionalGeometric Altitude GPS Required Altimeter Monitor Option for MK V and MK VII only System Display and AnnunciationStabilized Approach Monitor Option for MK V and MK VII only LOW Airspeed Monitor MK V Boeing 737NG only Long Landing Monitor Option for MK V and MK VII onlyLamp Format BelowBIT Description System Maintenance Maintenance PhilosophySystem Operation During AN Inop Condition Front Panel SELF-TEST Interface MK V and MK VII only Front Panel Test ConnectorEgpwc Front Panel Egpws Status LED’SSELF-TEST Functions External Computer Fault Fail Corrective Action Fault Isolation Troubleshooting GeneralTroubleshooting Guide SELF-TEST Preamble Level 1 SELF-TEST GO/NO GO TestSELF-TEST Inhibited Short Level 1 SELF-TESTGpws INHIBITED, Terrain Inhibited Gpws InhibitedLong Level 1 SELF-TEST Level 2 SELF-TEST Current FaultsCurrent Faults External Current Faults InternalFault Example Reason Gear Switch Fault Bussignal FaultBUS Wiring Fault Flap Switch FaultAudio Menu Invalid Program PIN Read ErrorSystem or Mode Tasked Failed Callouts Option InvalidSheet 31 Terrain Awareness no Valid Longitude Terrain AWARENESS-POSITION ErrorTerrain Clearance Floor Position Error Terrain Awareness no Valid LatitudeFollowing Information is Given in the Level 3 SELF-TEST Level 3 SELF-TEST System ConfigurationIRS 1 Attitude Mode Selected Egpws Line Maintenance Manual Following Information is Given in the Level 4 SELF-TEST Level 4 SELF-TEST Fault HistoryFollowing Information is Given in the Level 5 SELF-TEST Level 5 SELF-TEST Alert HistoryLevel 6 SELF-TEST Discrete Input Test 3 +28V Landing Gear Discrete Arinc 552 / ALT 55 Radio Altitude Validity Flag DiscretesGND Landing Gear Discrete 5 +28V Landing Flap or Flap Override Discrete GND Landing Flap Discrete or Flap OverrideSteep Approach Discrete #1 MK V and MK VII only Flap Position DiscretesSELF-TEST Discrete Steep Approach DiscretesGlideslope Validity Discretes Steep Approach Discrete #2GND ILS Tuned Discrete 10 +28V ILS Tuned DiscreteDecision Height Discrete GND Glideslope Cancel DiscreteGND Glideslope Inhibit Discrete 13 +28 V Glideslope Inhibit Discrete19 +28 V Audio SUPPRESSINHIBIT/ALL Modes Inhibit Discrete Mode 6 Volume Control DiscreteCallouts Enable Discrete MK V and MK VII only GND Audio SUPPRESSINHIBIT/ALL Modes Inhibit DiscreteSimulator Reposition MK V and MK VII only AOA Validity Discretes MK V and MK VII onlyDisplay Select Discretes Terrain Awareness & TCF InhibitAirspeed Validity Discrete Weather Radar ON/OFFLocalizer Validity Discretes MK V and MK VII only Attitude Validity DiscretesNormal Acceleration Validity Discrete Barometric Altitude Rate Validity DiscretesAcceleration SELF-TEST in Progress Discrete Longitudinal Acceleration Validity DiscreteAutopilot Disconnect Discretes PLI Deselect Switch Discretes MK V and MK VII onlyMagnetic Heading Validity Discrete AOA Vane Heater DiscreteMomentary Flap Override Discrete Tactical Select DiscreteAltitude Alert Discrete Corrected Barometric Altitude Validity DiscreteRaas Inhibit Discrete MK V and MK VII only Weight on Wheels DiscreteRaas Enable Discrete MK V and MK VII only Gpws Inhibit DiscreteLOW Airspeed Monitor Inhibit Discrete MK V 737NG only Loading a Database Maintenance Practices GeneralDatabase Update Database Update FrequencyObtaining AN Egpws Flight History Download Card Download ProcedureFlight History Downloading Via email aerotechsupport@honeywell.com Transcription of the Pcmcia CardSheet 54 CFG CAT 7 92 T CUW command/data string Servicing General REMOVAL/INSTALLATION 6.1 Egpwc RemovalInstallation Configuration Module MK VI, MK VIII, and MK Xxii onlyEgpws Ground Tests Display Switching Relays if InstalledADJUSTMENT/TEST Adjustment Repairs General CLEANING/PAINTING GeneralINSPECTION/CHECK General Appendix a Winviews Appendix B Troubleshooting DO’S and do NOT’S Maint Function Message Appendix C Raas Maintenance Messages Aural & DisplayedRAAS-NA-xxxx amber RAAS-RTO green RAAS-INOP amber Maint Function Displayed MessageSelf-Test Level 3 RCD Part Number Appendix D Stabilized Approach Monitor Maintenance MessagesAppendix E Altimeter Monitor Maintenance Messages Self-Test Level 1 Flaps Monitor Inop Appendix G Long Landing Monitor Maintenance Messages Self-Test Level 3 Airspeed Low Inhibited Annunciated at Appendix H LOW Airspeed Monitor Maintenance Messages

MK VIII, MK V, MK XXII, MK VII, MK VI specifications

Honeywell's range of control systems, particularly the MK VI, MK VIII, MK VII, V, and XXII, are pivotal innovations that have revolutionized process automation and control in various industries, especially in power generation and oil and gas sectors. Each of these systems comes with unique features and technologies to enhance operational efficiency, safety, and reliability.

The Honeywell MK VI control system is renowned for its ability to provide effective plant control and management tools, featuring advanced operator interfaces and robust hardware components. It employs a modular design, which allows for easy scalability and integration into existing infrastructure. The MK VI is equipped with Ethernet-based communication protocols, ensuring high-speed data transfer and enabling seamless connectivity with other systems.

The MK VIII system takes automation a step further, emphasizing enhanced performance and reliability. With its built-in redundancy and advanced diagnostics, the MK VIII minimizes downtime and optimizes maintenance efforts. Its powerful software tools are designed to improve operator decision-making, providing critical insights into plant operations and trends.

Honeywell’s MK VII control system is designed for high-performance applications, especially in gas turbine environments. It features advanced control algorithms, enabling precise control of emissions and improving overall efficiency. The MK VII stands out with its ability to maintain optimal performance under varying load conditions, ensuring reliability in challenging operational scenarios.

The MK V system is one of Honeywell's legacy products, known for its simple and user-friendly interface. Despite its age, it continues to be a dependable choice for many plants. It offers solid performance with basic control functions and has been a reliable backbone for older facilities transitioning into newer technologies.

Lastly, the MK XXII brings a modern twist to control systems with its focus on cybersecurity and data analytics. This system takes advantage of big data and IoT technologies, providing enhanced visibility of operations through real-time monitoring and predictive maintenance capabilities. The MK XXII ensures that plants not only operate efficiently but also mitigate risks associated with cyber threats.

Overall, Honeywell's series of control systems showcases their commitment to innovation and reliability in process automation, catering to the diverse needs of contemporary industrial environments. Each system is designed with specific features and capabilities that address the evolving challenges of process control, ensuring that users can achieve optimal performance and safety in their operations.
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