Technical data

Section 906
Digital RPM Indicator
Page Date: 6. April 2010
Pilot´s Operating Handbook
EXTRA 300LT
OPERATION BUTTONS
There are three panel buttons. Each button has two modes of operation.
PRESS-AND-HOLD operation mode
(press and hold for more than 2/3 of a second)
This operation mode is placarded above each button.(Hours, Clear,Trap)
Engine time (Hours)
The left button, upon depression, will cause the tachometer to display the non-fractional
portion (0000.) of the current accumulated engine hours. When the button is released, the
fractional part of the engine hours (.00) is displayed for a short period of time. The clock is
started whenever the engine rpm exceeds 800 rpm and is recorded in real hours.
Clear (Clear)
The middle button clears the rpm trap. During depression of the switch, the rpm trap is
zeroed. When the button is released, the trap will record the current engine rpm.
Engine rpm (Trap)
The right button will cause the tachometer to display the current contents of the rpm trap.
This trap records the highest engine rpm achieved before the button was pressed.
PRESS-AND-RELEASE operation mode
(press and release in less than 2/3 of a second)
This operation mode is placarded below each button.(L , DIM , R)
Masks (L , R)
During normal operation, the tachometer presents the average of the left and right internal
tachometers on the display. However, a mechanism exists to mask either tachometer from
the display, leaving the remaining tachometer to determine magneto/ignition problems.
Quickly pressing and releasing the left button (L), causes the tachometer to mask the left
tachometer.
Quickly pressing and releasing the right button (R), causes the tachometer to mask the right
tachometer.
Dimmer (DIM)
Quickly pressing and releasing the middle button (DIM), causes the tachometer to alternately
dim or brighten the LED indicators (except the large red LED of the rpm Range).
906.8 HANDLING, SERVICING AND MAINTENANCE
Not affected.