SEHT 40-10 USER MANUAL Edition 1
Page 2
HEADSET OPERATION
1. Rotate the flexible boom overhead to wear the microphone on either the right or left
side of the head.
2. Rotate the headset volume controls (on the ear shells) fully counter-clockwise to the
minimum position, before the headset plug is inserted into the aircraft or intercom.
3. With the headband resting securely on the top of the head check that the ear seal are
centred over the ears.
4. For best noise cancellation, position the microphone 0-6mm from your mouth.
5. Insert the microphone plug (PJ068) into the aircraft intercom microphone jack socket.
Insert the earphone plug (PJ055) into the aircraft intercom earphone jack socket.
6. The headset ANR circuitry is automatically switched on when the connectors are
inserted into the aircraft intercom system. The LED on the battery module will flash
approximately once every 5 seconds to indicate working and healthy battery power.
7. Rotate the headset volume knobs clockwise to a comfortable level.
CAUTION
1. Proper fit is critical to noise attenuation effectiveness. When wearing the headset
always push the headband down until it rests comfortably on the top of your head.
Move the ear cups slightly up or down or from side to side until you feel maximum
attenuation. The use of eyeglasses will reduce the attenuation, use thin temples on
your glasses to keep noise leakage at a minimum.
2. Use in Impulsive Noise Area: NRR is based on continuous noise and is not an
accurate indicator of the attenuation of impulsive noise such as gunfire. For maximum
protection we recommend the use of ear plugs in addition to a headset in such
environments..
3. Maintenance and Cleaning: In order for your headset to continue working properly,
always comply the following:
a. Never alter your headset.
b. If you see a defect such as splits in cups etc seek immediate replacement
or return to an approved SEHT service centre for repair.
c. Always fit SEHT approved replacement parts/accessories
4. Cleaning Instructions
a. Do not immerse in water.
b. Clean regularly with mild soap water. Sponge off head pad and ear seals,
Taking care to rinse thoroughly