AFI 11-2C-130v3 - BITS
AFI 11-2C-130v3 - BITS
AFI 11-2C-130v3 - BITS
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246 <strong>AFI</strong><strong>11</strong>-<strong>2C</strong>-130V3 23 APRIL 2012<br />
any mission scheduled for an exposure at or above FL 200 for times shown in Table 19.2<br />
Operational considerations dictate that pre-breathing must be completed before the cabin<br />
altitude exceeds 16,000 feet MSL. The aircraft commander, with recommendations from the<br />
PT, will determine the course of action for a break in pre-breathing. All personnel on board<br />
the aircraft will remain on 100 percent oxygen until cabin altitude is below FL 200. After<br />
descent below FL 200, all personnel will remain on 100% oxygen or select supplemental<br />
oxygen until 10,000 feet MSL. Pre-breathing will be conducted with a personally-fitted<br />
oxygen mask attached to an approved helmet and personal oxygen system. NOTE: Portable<br />
oxygen bottles may not be used for pre-breathing; the quick-don/smoke mask is emergency<br />
equipment and is not approved for pre-breathing or operations conducted at or above FL 200.<br />
19.16.4.1. The purpose of pre-breathing (denitrogenation) is to reduce the amount of<br />
nitrogen in the body and therefore reduce the risk of altitude-induced decompression<br />
sickness (DCS). Pre-breathing times are based on scientific research that outlines<br />
acceptable DCS risks. Major factors that enhance the effectiveness of denitrogenation<br />
are good hydration and good circulation.<br />
Table 19.2. Prebreathing Requirements and Exposure Limits for High Altitude<br />
Operations.<br />
Altitude Oxygen<br />
Requirement<br />
10,000 to 12,999 ft<br />
MSL<br />
Aircrew: 100% O2<br />
Jumpers: See <strong>AFI</strong> <strong>11</strong>-<br />
409<br />
Pre-breathe<br />
Time<br />
(3)<br />
Maximum Exposure<br />
Time Per Sortie (1) (2)<br />
N/A Aircrew: Unlimited<br />
Jumpers: See <strong>AFI</strong> <strong>11</strong>-409<br />
13,000 ft MSL to<br />
FL199<br />
100% O2 N/A Unlimited<br />
FL 200 to FL 249 100% O2 30 Min <strong>11</strong>0 Min<br />
FL 250 to FL 299 100% O2 30 Min 60 Min<br />
FL 300 to FL 349 100% O2 45 Min 30 Min<br />
NOTES:<br />
(1) Maximum exposure time per sortie is when cabin altitude reaches maximum planned<br />
altitude; extended or delayed ascent times expose everyone onboard to greater DCS risk;<br />
missions that require staggered altitude drops will use accumulative times per sortie information<br />
for mission planning. Mission planned drops at FL350, FL299, and FL249; 30 minutes upon<br />
reaching FL350, descend to FL299, spend only 30 minutes (60 accumulative), descend to<br />
FL249, spend only 50 minutes (<strong>11</strong>0 minutes accumulative). Limits based on not exceeding 23%<br />
DCS under laboratory conditions (
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