Piper ARCHER III Pilot Operating Handbook page 232

SECTION 9
SUPPLEMENT 5
NAV RECEIVER (CONT'D)
The inner knob operates in 50 kHz steps. The NAV receiver's lower and upper
frequency limits are 108.00 MHz and 117.95 MHz. Exceeding the upper limit
of frequency band will automatically return to the lower limit and vice versa.
Depressing the NAV frequency transfer button for 2 seconds or more will
cause the display to go in to the ACTIVE ENTRY mode. Only the ACTIVE
frequency will be displayed and it can be directly changed by using the NAV
inc/dec knobs. The display will return to the ACTIVE/STANDBY mode when
the NAV frequency transfer button is pushed.
Depressing the mode button will cause the NAV display to go from the
ACTIVE/STANDBY format to the ACTIVE/CDI (Course Deviation Indicator)
format as shown below in Figure 3-2. In the CDI mode, the
increment/decrement knob (pushed in) channels the ACTIVE frequency
window and depressing the frequency transfer button will cause the ACTIVE
frequency to be placed in blind storage and the STANDBY frequency (in blind
storage) to be displayed in the ACTIVE window display. When the ACTIVE
window is tuned to a VOR frequency, the standby frequency area is replaced
by a three digit OBS (Omni Bearing Selector) display. The desired OBS
course can be selected by pulling out the inner NAV frequency knob and
turning it. This OBS display is independent of any OBS course selected on an
external CDI or HSI. An "OBS" in the middle of the NAV display will flash
while the inner NAV frequency knob is pulled out. The CDI is displayed on
the line below the frequency/OBS. When the ACTIVE window is tuned to a
localizer frequency, the standby frequency area is replaced by "LOC" Figure
3-3. Illustrations of the display are shown on the next page.
NAV DISPLAY; ACTIVE VOR FREQUENCY/CDI FORMAT
REPORT: VB-1611
9-32
FIGURE 3-2
REVISED: APRIL 3, 1997
PA-28-181, ARCHER III
ISSUED: JULY 12, 1995