Like all Raptor Scientific instruments, operation of the Model 3719 Air Data Test Set is simple and intuitive, which shortens the learning curve for inexperienced operators. Commands and data, such as the target altitudes, airspeeds and slew rates, are entered using the front panel keypad. A clear, backlit LCD display summarizes measurement information at a glance and prompts the operator during the test process.
Two test modes are available: an Air Data Test mode using feet/Knots, feet/Mach or in-Hg units for calibrating aircraft instruments such as altimeters, airspeed indicators and rate-of-climb indicators, and a PS/PT test mode employing only in-Hg units for the calibration of absolute pressure/vacuum measurement devices. The operator can switch from controlling the simulated altitude and airspeed, or PS and PT pressure/vacuum, to a timed leak test at the push of a button.
The Model 3719 Air Data Test Set incorporates a number of safety features designed to prevent damage to the aircraft operating systems and instruments being tested. System pressure/vacuum can be safely vented at a controlled rate by pressing the Abort switch on the front panel, and a battery backup system prevents uncontrolled venting should a loss of external power occur. A unique pressure equalization system protects the instrument under test from rapid changes in pressure/vacuum when switching between test modes. Additionally, an embedded ARINC 565 safe flight envelope algorithm automatically detects and corrects for unsafe flight conditions commanded by the operator.
Hard copy records of test and calibration data can be produced using the convenient built-in dot matrix printer. An integral IEEE-488/GPIB interface and RS-232 port allow the test set to be controlled from a remote PC-compatible workstation using the Raptor Scientific or U.S. Air Force “Atlas” command sets. An optional remote control module with 100 feet of cable is available, allowing the operator to control the test set while he or she is seated in the cockpit of an aircraft observing the instruments being tested.
The Model 3719 Air Data Test Set can be powered using an 85 to 264 VAC, 50 to 400 Hz source, or the 28 VDC available in most aircraft. Rack-mounted (19”) and benchtop configurations of the Model 3719 Air Data Test Set require a customer-supplied 60 psi max. pressure source and a vacuum source for operation. Self-contained portable configurations of the test set incorporate the pressure and vacuum sources in a compact cabinet, as shown above. See below for details regarding the various Model 3719 Air Data Test Set configurations available and the included equipment.