Piper Navajo PA-31 Service Manual page 762

PIPER NAVAJO SERVICE MANUAL
use caution not to drop the lamps. Disconnect the electrical leads from the desired lamps.
b. To remove the lamp light assembly from the gear strut, disconnect the electrical
leads from the lamps and release the clamps that secure the assembly to the strut housing.
11-109. INSTALLATION OF LANDING LIGHT.
a.
To install the landing light lamps, attach the electrical leads to the lamp(s) and place
against the mounting pad. Position the attachment plate and secure with screws only tight
enough to allow the lamps to fit snug in the mount.
b.
To install the landing light assembly, position the assembly against the strut housing
with the bottom of the mounting bracket 5.63 inches up from the bottom of the housing. (Refer
to Figure 11-46.) Align the bracket longitudinally and secure with clamps. The light beam
angle may be adjusted by the adjustment screws at the sides of the bracket and tilting as
desired.
I 1-1 IQ. STALL WARNING HORN, INDICATOR AND DETECTOR. The stall warning
system consists of a lift detector which is electrically connected to a stall warning horn and
light. As stalling conditions are approached, the lift detector will activate the stall warning
horn and light.
The lift detector is located on the leading edge of the left wing. A tab will extend beyond
the leading edge at the point where the lift detector is mounted. With Master Switch in the ON
position, gently lift tab; stall warning horn and/or light should activate.
On airplanes with a stall warning time delay, the delay unit is located behind the
instrument panel on the window channel. The time delay unit assures a horn sound when the
lift detector switch closes and for four seconds after the detector switch opens.
A heated lift detector is incorporated with the deice group on Serial Nos. 31-8012001 and
up. This provides heat for the vane, plate and case to assure proper operation during icing
conditions.
II-111. REMOVAL OF LIFT DETECTOR.
NOTE
The master switch must be off prior to performing any work
on the left detector, warning horn or light. Place reference
marks on holding plate and wing skin for use when
reinstalling lift detector.
a. Remove four screws holding the plate around the tab. The lift detector is fastened to
this plate; remove the unit from wing.
b. Mark the electrical wires and terminals to facilitate reinstallation. Remove electrical
wires from lift detector; remove lift detector from aircraft.
11-112. INSTALLATION OF LIFT DETECTOR.
a. Attach electrical wires to their correct terminals on the lift detector.
b. Position the lift detector with its mounting plate on the wing, determining that the
sensor blade drops down freely; secure in position with the four screws previously removed.
Reissued: 10/12/79
ELECTRICAL SYSTEM
4D12