directional gyro


Also found in: Dictionary.

directional gyro

[də′rek·shən·əl ′jī·rō]
(aerospace engineering)
A flight instrument incorporating a gyro that holds its position in azimuth and thus can be used as a directional reference. Also known as direction indicator.
(mechanics)
A two-degrees-of-freedom gyro with a provision for maintaining its spin axis approximately horizontal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

directional gyro

directional gyroclick for a larger image
directional gyro
i. A two-degree-of-freedom gyro with a provision for maintaining its spin axis approximately horizontal.
ii. A flight instrument incorporating a gyro that holds its position in azimuth and thus can be used as a directional reference.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
1394T100-14RB $1500 S-TEC AUTOPILOT DIRECTIONAL GYRO KG102A $2000 B/K REMOTE ELECTRIC DIRECTIONAL GYRO 4000B-30 $900 A/P HEADING OUTPUT HSI KI525A-01 $2000 KING WITH SYNCHRO HSI NSD360A $3000 CENTURY SLAVED VSI 7000C $450 UNITED 0-2000 AIRSPEED 8000-XX $1000 CUSTOM MARKINGS TYPE SUGGESTION ALTIMETER OVERHAUL OR EXCHANGE ALTIMETER INSTALL ENCODER, STD ALT ATTITUDE GYRO OVERHAUL OR EXCHANGE ATTITUDE GYRO OVERHAUL OR EXCHANGE TURN COORD.
Simply put, think of an HSI as a directional gyro with a course deviation indicator mounted on the compass card.
Instruments available for spatial orientation by 1932 included the inclinometer, turn indicator, climb indicator, air speed indicator, spinning top, Sperry Artificial Horizon, Sperry Directional Gyro, the pitch-azimuth indicator, the flight integrator (described below), and the Air-I-Zon (an early version of angle-of-attack).
As one who recently suffered the failure of my directional gyro and watched it spin wildly as it wound down, I wouldn't want to be distracted by those actions while, say, shooting an ILS to minimums.
However [section]91.205 (d) specifies additional equipment required for IFR which we condense into the memory aid GRABCARD--generator, radios, alternator, ball, clock, attitude indicator, rate of turn indicator, directional gyro. Note that the clock is supposed to be built into the panel, not a wristwatch.
Below the AI is the directional gyro. This arrangement allows the pilot to minimize eye movements when viewing all gauges and returning to scan the AI.
These are the attitude indicator (AI) and the heading indicator or directional gyro (HI/DG), plus the turn coordinator (TC) or turn-and-bank indicator (T&B).
Without a nav or GPS interface, think of the G5 simply as a digital directional gyro with heading reminder, plus there is a data field at the top of the display showing current heading.
Section d for IFR operations requires a "Gyroscopic direction indicator (directional gyro or equivalent)." Again, no mention of "magnetic."
At Sun 'n Fun, Garmin released the electronic directional gyro feature for the G5 (the instrument connects to an external magnetometer for heading display), plus an electronic FISI for displaying lateral and vertical course guidance from Garmin navigators and navcomms.
Place the paper clip on the face of the directional gyro with the tail on the holding radial.

Full browser ?