submission - Independent Pilots Association

223 Duty period- To reducc vulncrabiliry to performancc-impairing fatiguc from cxtended
hours of conrinuous wakefulness and prolonged pcrids of continuous pcrformancc requirements,
cr¡mularive dury pcr 24 horns should bc limitcd- It is rccommcrded that this limit not exceed
14 hot¡n wi¡hin a 24-hotu perid. (In the case of additional flight crew, sec section 2.3.6.)
2.3 Flight Duty Periods
23.1 Definition: 'ftight duty period"- The period of time that begins when a ctew membcr
is required ro rcport for a duty pcrioa dret includcs one or møe flighs and ends u thc block-i¡
tiæ of ûre ñnal flight scgnrcnt At a minim,,m, this perid includes required Pre-f,i$t activities
and ftight timc.
232 Definition: "rrindow of circadian low'- The window of circadia¡ low is bcst
estinaæd by thc houn between 0200 and 0600 fq individr¡als adaptcd o a r¡sr¡al day-wakqhigùtslccp
schcdule. This estimate of tbe window is calculatcd fr,m scie¡rtiñc data on thc circadian low of
cc, alerrncss, srbjectivc repct G.e., peak fatiguc), a¡d body tcmpcratr¡re Fr flight duty
psriods thet cross 3 q fewcr timc zo¡¡es' tl¡e wi¡rdow of circadi¡ri low is ç5tirnatcd to bc 02tr to
0600 Uoæ-base/domicib time. For flight duty pcriods üat cross 4 or mqe tiæ zones, the window
of circadian low is estimated to bc 02tr to 0600 home-basc/domicile time føùc frst 4t hors only.
After a cr€w membcrrcmains mre tban 48 hor¡¡s away from bme-basc/domiciþ, thc window of
ci¡cadian low is g5tim¡¡¡{ to be 0200 o 0600 rÊferred to local timc at the point of dcprure
233 Standard flight duty period- To reducc vulnerability to pcrformance-imPairing fuigue
from exænded hou¡s of continuous wakefulness and prolonged pcriods of continuous performance
rcquirements, cumulative flight duty pcr 24 hor¡rs should be limitcd It is recommended ùu fø
standa¡d opcrations, this cumulativc flight dury period not excccd l0 hor¡n ,¡/ithin a 24-bor¡r
penod- Sta¡da¡d operations i¡rclude multiple flight segrrrnts a¡rd day or night flytng.
23.4 Extended flight duty period- An extended cu-ulative flight dury príod should be
limitcd to 12 hours u/ithin e 24-hour period to be accompanied by additional rcstrictions a¡rd
compcnsarory off-dury periods. This limi¡ is based on scientific findings from a variety of sources,
including dau from aviuion, that deoonstrate a significantly increascd wlnerabiliry fø
performance-impairing fatigue afl¡cr 12 hor¡rs. It is readily acknowledged tlrat in current practicc,
flight dury pcriods exter¡d to l4 hor¡rs in regular operations. Howevet, the available scicntific data
s¡ppqr a guideline different from currc¡rt operarional practice. Thc data indicue that perfømanccimpairing
fatigue does i¡¡creasc beyond t¡e l2-hor¡r limi¡ ¿¡¡i could reduce the safety magin
2J-5 Extended flight duty period: restrictions and compensatory off-duty periodstf
¡þs çnmulæive flight dury period is exændcd o 12 hor¡rs then the following rcstriaions a¡d
compensatory off-dury p€riods should bc applied
A. Cutnutatíve $ecs: tøxínm cumdaíve løu¡s of øension. Over time, ex¡ended flight dury
periods can result in cumulative effecs of fatigue. To support opcrational flcxibility and still
minimizc ttrc potential for cumulative effecs, it is rccommended ¡hat extended flight dury pertods
can bc schedr¡led for a cumulative total of 4 hor¡n u/ithin a74ay perid For example, Ûterc could
be wo 2-hou¡ extensions of the standa¡d lGhou¡ flight dury pcriod (2 x2 = 4 hr) or fou¡ l-hour
extensions(4x1=4hr).
B. Flíght dtuy periods duríng wíndow of círcodian low.As described in Section 2.1.4, the
window of circadian low (as defined in Section 2.3.2) is associated with higher levels of