22 

14 CFR Ch. I (1–1–24 Edition) 

§ 117.5 

Physiological night’s rest 

means 10 

hours of rest that encompasses the 
hours of 0100 and 0700 at the flightcrew 
member’s home base, unless the indi-
vidual has acclimated to a different 
theater. If the flightcrew member has 
acclimated to a different theater, the 
rest must encompass the hours of 0100 
and 0700 at the acclimated location. 

Report time 

means the time that the 

certificate holder requires a flightcrew 
member to report for an assignment. 

Reserve availability period 

means a 

duty period during which a certificate 
holder requires a flightcrew member on 
short call reserve to be available to re-
ceive an assignment for a flight duty 
period. 

Reserve flightcrew member 

means a 

flightcrew member who a certificate 
holder requires to be available to re-
ceive an assignment for duty. 

Rest facility 

means a bunk or seat ac-

commodation installed in an aircraft 
that provides a flightcrew member 
with a sleep opportunity. 

(1) 

Class 1 rest facility 

means a bunk 

or other surface that allows for a flat 
sleeping position and is located sepa-
rate from both the flight deck and pas-
senger cabin in an area that is tem-
perature-controlled, allows the 
flightcrew member to control light, 
and provides isolation from noise and 
disturbance. 

(2) 

Class 2 rest facility 

means a seat in 

an aircraft cabin that allows for a flat 
or near flat sleeping position; is sepa-
rated from passengers by a minimum of 
a curtain to provide darkness and some 
sound mitigation; and is reasonably 
free from disturbance by passengers or 
flightcrew members. 

(3) 

Class 3 rest facility 

means a seat in 

an aircraft cabin or flight deck that re-
clines at least 40 degrees and provides 
leg and foot support. 

Rest period 

means a continuous period 

determined prospectively during which 
the flightcrew member is free from all 
restraint by the certificate holder, in-
cluding freedom from present responsi-
bility for work should the occasion 
arise. 

Scheduled 

means to appoint, assign, 

or designate for a fixed time. 

Short-call reserve 

means a period of 

time in which a flightcrew member is 

assigned to a reserve availability pe-
riod. 

Split duty 

means a flight duty period 

that has a scheduled break in duty that 
is less than a required rest period. 

Suitable accommodation 

means a tem-

perature-controlled facility with sound 
mitigation and the ability to control 
light that provides a flightcrew mem-
ber with the ability to sleep either in a 
bed, bunk or in a chair that allows for 
flat or near flat sleeping position. Suit-
able accommodation only applies to 
ground facilities and does not apply to 
aircraft onboard rest facilities. 

Theater 

means a geographical area in 

which the distance between the 
flightcrew member’s flight duty period 
departure point and arrival point dif-
fers by no more than 60 degrees lon-
gitude. 

Unforeseen operational circumstance 

means an unplanned event of insuffi-
cient duration to allow for adjustments 
to schedules, including unforecast 
weather, equipment malfunction, or air 
traffic delay that is not reasonably ex-
pected. 

Window of circadian low 

means a pe-

riod of maximum sleepiness that oc-
curs between 0200 and 0559 during a 
physiological night. 

[Doc. No. FAA–2009–1093, 77 FR 398, Jan. 4, 
2012; Amdt. 117–1A, 77 FR 28764, May 16, 2012; 
Amdt. 117–1, 78 FR 69288, Nov. 19, 2013] 

§ 117.5 Fitness for duty. 

(a) Each flightcrew member must re-

port for any flight duty period rested 
and prepared to perform his or her as-
signed duties. 

(b) No certificate holder may assign 

and no flightcrew member may accept 
assignment to a flight duty period if 
the flightcrew member has reported for 
a flight duty period too fatigued to 
safely perform his or her assigned du-
ties. 

(c) No certificate holder may permit 

a flightcrew member to continue a 
flight duty period if the flightcrew 
member has reported him or herself too 
fatigued to continue the assigned flight 
duty period. 

(d) As part of the dispatch or flight 

release, as applicable, each flightcrew 
member must affirmatively state he or 
she is fit for duty prior to commencing 
flight.