Overview

Description

A configuration file defines the alerts by applying logic to defined states, threshold values or an envelope of flight, engine or aircraft configuration data.

A basic implementation example may include Oil Pressure, Oil Temperature, Low Fuel, Alternator, Starter, Doors and Hatches, Gear unsafe, Voltage and Alternator alerts. These basic alerts can all be generated using directly connected switched and analogue inputs. A simple configuration file maps these to the illuminated captions and voice alerts and consolidates alerts into a Master Warning/ Caution switch.

More advanced alerts can be generated when flight and engine data is added through connection to an EFIS or engine monitor. By combining aircraft configuration data with flight and engine data, Envelopes and Profile alerts can be generated. Examples include recognizing that the landing gear should be down based on airspeed, rate of descent and Height AGL, that oil pressure is too low for the current RPM, that airspeed is outside of the envelope for the current aircraft configuration or that oxygen should be on above a specified altitude.

Careful thought has gone into human factors with auto mute on startup to keep the cockpit quiet when you turn on the master switch and adjustable damping on alert triggers to prevent transitory events causing unnecessary alarms. If your EFIS data feed is off or faulty, the system generates a voice alert to let you know.

The optional AH501 Master/Caution attention-getter / acknowledgement switch helps to draw the pilot?s attention to an anomaly, its switch turns unacknowledged captions to steady and mutes the audio.

Custom legends, voice alerts and basic configuration are all included.

The unit measures 6.25in(159mm) by 1.72in(44mm) and has a panel depth of 1in(25mm) as detailed in the Panel Drawing and Installation sheet.

FAQ

• To generate intelligent alerts based on aircraft configuration combined with flight and engine data it may be necessary to boost the number of digital and analogue data inputs available in the AH500 and AH502 annunciators. A single legend like ?Check Doors? may benefit frommonitoring each door and hatch independently to generate accompanying voice alerts which state which door is unlatched. A check gear alert may benefit from monitoring all limit switches as well as gear selector position in combination with EFIS flight data to generate intelligent alerts. There are many more examples where digital and analogu inputs may exceed the number available in the standard annunciators.

• The unit does not need configuration. It feeds data against each input over the RS232 serial data interface directly to the annunciator panel which can reference the AH504 inputs using the XML programmable logic functions.

• An experienced avionics engineer should be able to easily configure and install the unit. We provide information within this website and provide free of charge support to assist in configuration and installation by telephone and email for installers in the USA and Europe.

Features

• 13 x protected, filtered and buffered volt-free switched inputs
• 4 x 0-32Volt, 0.01Volt resolution analogue inputs
• RS232 interface to connect to AH500 or AH502SD
• Power 10-32V DC

Documents

• Specifications (PDF)
• Installation Manual (PDF)
• Warranty (PDF)
• D-Sub Kit Installation Instructions (PDF)

In The Box

• AH504 I/O Expansion Unit
• Installation kit
• AH504 Installation Manual