Sennheiser HMEC 46-1 User Manual

Instructions for use

HMEC 46-1

Safety instructions

• Please read this instruction manual carefully and com­pletely before using the headset.

• Make this instruction manual easily accessible to all
users at all times.

• Always include this instruction manual when passing
the headset on to third parties.

• During flight operation, do not use the headset for
telephone calls.

• With the NoiseGard™ active noise compensation
switched on, typical aircraft sounds (for example,
those from engines, propellers, warning alarms, etc.)
may sound different to you. Before operating any air­craft, make sure that, with NoiseGard™ switched on,
you can hear and recognize these sounds. Set the
volume to safe levels that do not interfere with your
ability to hear informational sounds and warning
alarms.

• The headset is capable of producing sound pres­sure levels exceeding 85 dB(A). In many countries
85 dB(A) is the maximum legally permissible level for
continuous noise exposure during the working day.
Exposure to sounds of higher volume levels or for
longer durations can permanently damage your
hearing!

• Never repair or attempt to repair a defective headset
yourself. Contact your Sennheiser agent or the
Sennheiser Service Department.

1

• Only replace those parts of the headset whose
replacement is described in this instruction manual.
All other parts of the headset must be replaced by
your Sennheiser agent.

• Protect the headset from humidity. Use only a slightly
damp cloth to clean the headset. For information on
how to clean the headset, contact your Sennheiser
agent.

Intended use of the headset

Intended use includes:

• having read this instruction manual especially the
chapter “Safety instructions”.

• using the headset in aircraft cockpits and within the
operating conditions as described in this instruction
manual.

Improper use

Improper use means using the headset other than as
described in this instruction manual, or under operating
conditions which differ from those described herein.

2

The HMEC 46-1 headset

The HMEC 46-1 headset with NoiseGard™ active noise com­pensation features dynamic, open headphones. The noise­compensating condenser microphone ensures excellent
speech transmission even in noisy environments. Designed
for use in aircraft cockpits.

Features

• NoiseGard™ active noise compensation reduces
ambient noise by at least 15 dB – consequently the
radio volume can be decreased

• Extremely lightweight

• Extremely comfortable to wear due to the patented
two-piece automatic headband and soft ear pads

• Peak level protection safeguards you from volume
peaks above 110 dB

• “Flip-away” headphone allows single-sided listening

• Flexible microphone boom, can be worn on either left
or right-hand side

• Noise-compensating condenser microphone ensures
excellent speech transmission

• Single-sided cable, easy to replace

• With NoiseGard™ switched off, the headset can be
used as a conventional headset

• Power supply for NoiseGard™ from aircraft DC power
supply system (on suitably equipped aircraft) or bat­teries/rechargeable batteries

• “Auto shut-off” extends battery life

• ETSO (C57a/C58a)/TSO (C139) approval

3

Delivery includes

•HMEC 46-1 headset

•Cable clip

• Wind and pop screen

•Instruction manual

•Carry bag

•EASA Form 1

Operation

Turning the microphone boom

The microphone boom can be rotated. This allows the
headset to be worn with the microphone boom posi­tioned on either the left or right-hand side of the head.

4

Putting on the headset

When putting on the headset, the patented two-piece
headband adjusts automatically.

Positioning the microphone

Bend the flexible microphone boom so that the micro­phone is placed at the corner of the mouth. Maintain a dis­tance of approx. 2 cm between microphone and mouth.

5

Flipping away one earcup

CAUTION!

The headset features a “flip-away” earcup for single-sided
listening.

Adjusting the volume directly on the audio system

Connect the headset to the corresponding sockets of your
audio system. Adjust the volume directly on the audio
system.

Hearing damage due to high volumes!

This headset is capable of producing high
sound pressure levels. Higher volumes or
longer durations can damage your hearing!

Set the volume to a medium level. Make sure
that you can hear critical environmental
sounds and warning alarms.

6

Adjusting the microphone sensitivity

The microphone sensitivity has been factory pre-set to
80 mV/Pa as per RTCA DO-214. You can change the
microphone sensitivity by turning a small screwdriver in
the direction of the arrow.

+

–

7