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path of aircraft traveling at high speed (up to 60 knots) from the runway center to a point on the center of a
taxiway. A high-speed taxiway is also referred to as a long-radius exit or turn-off taxiway and is designed
to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time.
high-strength steel. Steel whose tensile strength can be increased by proper heat treatment to between
50,000 and 100,000 pounds per square inch.
high-tension magneto (reciprocating engine ignition system). A self-contained ignition system used with
a spark-ignition reciprocating engine. A high-tension magneto contains an alternating current generator that
produces a flow of primary current, and a set of breaker points that interrupts this current the instant the
spark is needed.
When the primary current stops flowing, its magnetic field collapses. The collapsing lines of flux
cut across many thousands of turns of wire in the secondary winding of the built-in magneto coil and
induces a high voltage into it. The distributor, which is a high-voltage selector switch, directs the high
voltage from the magneto coil to the proper spark plug for ignition.
high unmetered fuel pressure. The pressure in a Teledyne-Continental fuel injector pump that is adjusted
by the variable orifice.
high vacuum. An absolute pressure of between 1 x 10-3 and 1 x 10-6 millimeters of mercury.
hinge. A form of fastener that allows one connected piece to rotate with respect to the other. Hinges are
used to connect a door to the edge of an opening in a compartment or bulkhead. The hinges allow the door
to swing, or rotate, open or closed. Ailerons are attached to a wing trailing edge with hinges so they can
rotate with respect to the wing surface.
Hipernik. The registered trade name for a magnetic alloy made of 50% iron and 50% nickel.
Hi-Shear rivet. A patented, high-strength, pin-type fastener used in aircraft construction. Hi-Shear rivets
are often used in place of bolts in strong, lightweight structure.
The pin of a Hi-Shear rivet has a thin, flat head on one end and a groove around its shank at the
other end. The pin is pressed through a tight-fitting hole in the pieces of metal to be joined, and a soft steel
or aluminum alloy collar is slipped over its grooved end. A swaging tool forces the collar into the groove
and pulls the head of the rivet tight against the metal through which it is installed.
HIWAS (hazardous in-flight weather advisory service) (air traffic control). Continuously recorded
hazardous in-flight weather forecasts broadcast to airborne pilots over selected VOR outlets defined as
HIWAS broadcast areas.
Hobbs meter. The registered trade name of an operating-time indicator used with reciprocating engines to
show the number of hours the engine has operated. The Hobbs meter consists of a clock that is actuated by
an engine oil pressure switch. When the engine is producing oil pressure, the clock runs, but when oil
pressure is lost at engine shutdown, the clock stops.
hold, or holding, procedure (air traffic control). A predetermined maneuver which keeps aircraft within
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
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a specified airspace while awaiting further clearance from air traffic control.
“Hold for release” (air traffic control). A phrase used by ATC to delay an aircraft for traffic management
reasons; i.e., weather, traffic volume, etc. Hold for release instructions (including departure delay
information) are used to inform a pilot or a controller (either directly or through an authorized relay) that an
IFR departure clearance is not valid until a release time or additional instructions have been received.
holding coil (electrical relay). An auxiliary coil in an electrical relay. Current flowing through the holding
coil keeps the relay energized after the control current that caused the relay to close has stopped flowing
through the main coil.
holding fix (navigation). A specified fix identifiable to a pilot by navaids or visual reference to the ground,
used as a reference point in establishing and maintaining the position of an aircraft while holding.
holding point (ICAO). A specified location, identified by visual or other means, in the vicinity of which
the position of an aircraft in flight is maintained in accordance with air traffic control clearances.
holding relay. An electrical relay whose coil is in series with its contacts. The contacts are closed by
sending a pulse of current through the coil, and the contacts remain closed until the current flowing through
them is interrupted.
hold-short point (air traffic control). A point on the runway beyond which a landing aircraft with a land
　
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