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oxygen mixed with cabin air as cabin altitude increases. Above approximately 27,000 feet cabin
altitude, NORMAL mode provides 100% oxygen. The “100%” position provides 100% oxygen at all
cabin altitudes. To provide the quickest recovery from hypoxia symptoms, the mask should be
stowed with 100% selected. To conserve oxygen, in the absence of smoke/fumes, the mask should
be switched to NORMAL when worn at any cabin altitude for an extended period of time.
(Continued Next Page)
AVAILABLE TIME IN MINUTES
CABIN
ALTITUDE
2
COCKPIT
2
COCKPIT,
1 CABIN
2
COCKPIT,
2 CABIN
2
COCKPIT,
3 CABIN
2
COCKPIT,
4 CABIN
8000
10,000
15,000
20,000
341
392
383
310
129
136
137
128
80
83
84
80
58
59
60
59
45
46
47
46
25,000
30,000
35,000
40,000
171
225
305
429
96 67 51 42
AVAILABLE TIME IN MINUTES
CABIN
ALTITUDE
1
COCKPIT
1
COCKPIT,
1 CABIN
1
COCKPIT,
2 CABIN
1
COCKPIT,
3 CABIN
1
COCKPIT,
4 CABIN
8000
10,000
15,000
20,000
682
784
766
619
159
165
167
161
90
92
94
93
63
64
65
65
48
49
50
50
25,000
30,000
35,000
40,000
342
450
610
857
134 84 61 48
510FM-07 AA 3-175
SECTION III - OPERATING PROCEDURES MODEL 510
NORMAL PROCEDURES
FAA APPROVED
U.S. Configuration
CREW OXYGEN MASKS (Continued)
Depressing a red tab on the front of the mask (left side, as viewed while wearing mask) inflates the
harness for donning. Releasing the tab causes the harness to conform to the user's head. To prevent
damage to the harness, it should not be inflated until the mask is completely out of the storage box.
The mask automatically supplies oxygen under pressure (pressure breathing) beginning at
approximately 35,000 feet cabin altitude. Automatic pressure breathing is available in either
NORMAL or 100% mode. Once pressure breathing begins, pressure supplied to the mask gradually
increases as cabin altitude increases. Ability to speak via the mask microphone is not significantly
impaired during pressure breathing.
A red knob on the bottom of the mask labeled EMERGENCY provides selection of 100% oxygen
flow and creates a positive oxygen pressure in the mask. Turning the knob approximately one
quarter turn in the direction of the arrow selects EMERGENCY mode. Pressing the knob “in”
momentarily may be used for mask pre-flight to make sure of flow to the mask. Continuous
EMERGENCY mode must be used in a smoke/fume environment to provide positive pressure to the
mask and smoke goggles. Once the need for emergency pressure has been alleviated,
EMERGENCY mode should be deselected as the oxygen consumption rate is high.
Smoke goggles (if provided with the EROS mask) are designed to fit over the mask and interface
with a vent on the outside of the mask nose-bridge area. In a smoke/fumes environment, the mask
should be donned first, then the goggles. A gray plastic slide on the mask nose bridge may then be
pulled downward, opening the goggle vent. The vent is fully open when a red band is visible above
the slide. The upper harness tubes should be placed over the goggles frame lower sides to provide
maximum sealing. When smoke/fumes have been eliminated the mask should be switched out of
EMERGENCY mode and the nose bridge valve closed.
NOTE
Headsets or hats worn by the crew should be removed prior to donning the oxygen
masks.
OXYGEN MASK MIC AND HEADSET MIC
A two-position MIC toggle switch is provided on the instrument panel just below the pilot’s and
copilot’s control yokes. The switch positions are marked OXYGEN MASK and HEADSET.
Depressing the MIC button on the appropriate control wheel allows a crew member to transmit
through the headset microphone or oxygen mask microphone, whichever is selected. Transmit sidetone
and intercom will be heard in the cross-side speaker. Received audio and aural warnings will be
heard in the on-side speaker. All audio is also available in the headsets.
3-176 AA 510FM-07
MODEL 510 SECTION III - OPERATING PROCEDURES
NORMAL PROCEDURES
FAA APPROVED
Configuration U.S.
ELECTRIC TRIM
ELEVATOR TRIM
An electric elevator trim switch is installed on the both pilot control wheels and provides powered
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Citation Mustang airplane flight manual 1(120)
