Airmar P39 Owner'S Manual & Installation Instructions Download Page 1

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Transom-Mount 

with

 Release Bracket

 Transducer or TRIDUCER

®

 Multisensor

Model 

P39

U. S. Patents: 5,606,253

Mounting Location

CAUTION

: Do not mount in an area of turbulence or bubbles: 

near water intake or discharge openings; or behind strakes, 
struts, fittings, or hull irregularities

CAUTION

: Avoid mounting the transducer where the boat may be 

supported during trailering, launching, hauling, or storage.

• For the best performance, the transducer must be in contact 

with smooth water. To identify an area of “clean” water, observe 
the water flow off the transom while the boat is underway.

• Allow headroom space above the bracket for it to release and 

rotate the transducer upward (see Figure 1).

• Mounting on the starboard side of the hull where the propeller 

blades are moving downward is preferred.

• Mount the transducer as close to the centerline (keel) of the 

boat as possible to ensure the transducer remains in the water 
when the boat is turning.
-

Single drive boat

—Mount at least 75mm (3") beyond the 

swing radius of the propeller (see Figure 2).

-

Twin drive boat

—Mount the transducer between the drives.

Record the information found on the cable tag for future reference.

Part No._________________Date___________Frequency________kHz

 Figure 1. Stepped transom

headroom

Headroom

NO speed sensor

109mm (4-5/16")

Headroom with

speed sensor

130mm (5-1/8")

TRIDUCER® 

multisensor

P39

Figure 2. Mounting location

75 mm (3")

minimum

swing radius 

on single drive boat

INSTALLATION INSTRUCTIONS

OWNER’S GUIDE      &

WARNING

: Always wear safety goggles and a dust 

mask when installing to prevent personal injury.

WARNING

: When the boat is placed in the water, 

immediately check for leaks around the screws and 

any other holes drilled in the hull.

CAUTION

: Never pull, carry, or hold the transducer 

by the cable as this may sever internal connections.

CAUTION

: Never strike the transducer with anything 

except the palm of the hand. Never strike the 

paddlewheel.

CAUTION

: Never use solvents. Cleaners, fuel, paint, 

sealants, and other products may contain strong 

solvents, such as acetone, which attack many 

plastics greatly reducing their strength.

IMPORTANT

: Please read the instructions 

completely before proceeding with the installation. 

These instructions supersede any other instructions 

in your instrument manual if they differ.

Applications

• Not recommended for boats with large inboard engine(s).
• Good operation up to 44kn (50MPH)
• Vertically orients sound beam on hull with deadrise angle up to 30°
• Adjusts to transom angles from 2

°

–22

°

• Bracket protects transducer from frontal impact only

Tools & Materials

Safety goggles
Dust mask
Pencil
Electric drill
Drill bits:

Bracket holes

4mm, #23, 

or

 9/64"

Transom hole (optional) 18mm, 11/16", 

or

 3/4"

Cable clamp holes

3mm 

or

 1/8"

Masking tape
Angle finder
Grommets (some installations)
Marine sealant (suitable for below waterline)
Screwdrivers
Straight edge
Cable ties
Water-based anti-fouling paint (

mandatory in salt water

)

Copyright © 2003 - 2011 Airmar Technology Corp.

beyond

Copyright © 2003 Airmar Technology Corp.

headroom required

NOTE: Starboard 
side of hull where 
propeller blades are 
moving downward is 
preferred.

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