MOONEY SECTION VII
MODEL M20J AIRPLANE AND SYSTEMS DESCRIPTION
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(
NOTE
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Do not attempt to adjust prestall warning speed by
bending the vane. This part has been heat treated and
cannot be bent without damaging or breaking the vane.
EMERGENCY LOCATOR TRANSMITTER
The Emergency Locator Transmitter (ELT) is located in the tailcone and is ac-
cessible by removing the radio access panel on the left side of the fuselage.
The emergency locator transmitter meets the requirements of FAR 91.52 and
is automatically activated by a longitudinal force of 5 to
7
g's. The ELT trans-
mits a distress signal on both 121.5 MHz and 243.0 MHz for a period of from
48 hours in low temperature areas and up to 100 hours in high temperature
areas. The unit operates on a self-contained battery. The battery should be
checked at annual inspections.
The battery has a useful life of four years. However, to comply with
FAA
regulations it must be replaced after two years of shelf life. The battery
should also be replaced if the transmitter has been used in an emergency
situation or if accumulated test time exceeds one hour.
The replacement
date is marked on the transmitter label.
On the unit itself is a three position selector switch placarded "OFF", "ARM",
"ON".
The "ARM" position is provided to set the unit to the automatic position
so that it will transmit only after impact and will continue to transmit until the
battery is drained to depletion or until the switch is manually moved to the
"OFF
position. The "ARM" position is selected when the transmitter is in-
stalled at the factory and the switch should
remain
in that position whenever
the unit is installed in the airplane. The "ON" position is provided so the unit
can be used as a portable transmitter or in the event the automatic feature
was not triggered by impact or to periodically test the function of the transmit-
ter.
Select the "OFF position when changing the battery, when rearming the unit
if it has been activated for any reason, or to discontinue transmission.
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I
NOTE
I
---em---
If the switch has been placed in the
"ON"
position for any
reason, the
"OFF
position has to be selected before selecting
"ARM".
If
"ARM"
is selected directly from the
"ON"
position
the
unit will continue to transmit
in
the
"ARM"
position.
REV.
B
6-12-87
ISSUED 6-2-86
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