Table 7 Comparison of KSS data for flight crews operating under the two policies (Mean ± standard deviation \(\overline{\mathrm{x}}\) ± s)
Moment of take-off | Flight phase | Operational policy and flight crew | Outbound | Return trip | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Early morning(4:00) | Take-off/landing | – | Pre | SF-E | R-E | Post | Pre | SF-E | R-E | Post |
Exemption policy (Group a flies the outbound trip; Group c flies the return trip) | 1.20 ± 0.40 | 2.25 ± 0.83 | 2.60 ± 1.02 | 3.55 ± 0.74 | 1.90 ± 0.77 | 2.65 ± 0.73 | 3.75 ± 1.51 | 5.25 ± 1.30 | ||
CCAR-121(Group m flies the round trip) | 1.40 ± 0.49 | 2.45 ± 0.67 | 2.65 ± 1.01 | 3.65 ± 0.79 | 3.40 ± 1.11 | 4.50 ± 1.16 | 3.65 ± 0.65 | 3.05 ± 0.74 | ||
Cruising | – | Pre | SF-S | SF-E | Post | Pre | SF-S | SF-E | Post | |
Exemption policy (Group b flies the outbound trip; Group d flies the return trip) | 1.80 ± 0.40 | 2.35 ± 0.48 | 4.45 ± 0.59 | 5.30 ± 0.649 | 2.50 ± 0.50 | 3.45 ± 0.59 | 5.90 ± 0.62 | 6.90 ± 0.83 | ||
CCAR-121(Group n flies the round trip) | 2.25 ± 0.43 | 2.50 ± 0.50 | 4.30 ± 0.64 | 5.35 ± 0.73 | 3.60 ± 0.49 | 4.05 ± 0.67 | 5.80 ± 0.68 | 4.95 ± 1.16 | ||
Noon(12:00) | Take-off/landing | – | Pre | SF-E | R-E | Post | Pre | SF-E | R-E | Post |
Exemption policy (Group e flies the outbound trip; Group g flies the return trip) | 2.45 ± 0.67 | 3.60 ± 0.66 | 3.95 ± 0.86 | 5.25 ± 0.62 | 2.85 ± 0.96 | 4.25 ± 0.70 | 4.75 ± 1.18 | 5.65 ± 1.52 | ||
CCAR-121(Group o flies the round trip) | 2.55 ± 0.50 | 4.35 ± 0.48 | 4.80 ± 1.12 | 5.65 ± 1.11 | 2.45 ± 0.80 | 3.90 ± 1.34 | 2.40 ± 0.66 | 3.85 ± 1.53 | ||
Cruising | – | Pre | SF-S | SF-E | Post | Pre | SF-S | SF-E | Post | |
Exemption policy (Group f flies the outbound trip; Group h flies the return trip) | 2.30 ± 0.78 | 3.35 ± 0.73 | 5.85 ± 0.73 | 6.05 ± 0.97 | 3.50 ± 0.50 | 3.65 ± 0.48 | 5.05 ± 0.86 | 4.95 ± 1.32 | ||
CCAR-121(Group p flies the round trip) | 2.25 ± 0.77 | 2.45 ± 0.50 | 5.50 ± 1.16 | 6.10 ± 1.09 | 2.45 ± 0.50 | 2.55 ± 0.50 | 3.90 ± 1.04 | 3.50 ± 0.59 | ||
Evening(20:00) | Take-off/landing | – | Pre | SF-E | R-E | Post | Pre | SF-E | R-E | Post |
Exemption policy (Group i flies the outbound trip; Group k flies the return trip) | 2.70 ± 0.64 | 4.10 ± 0.77 | 3.60 ± 0.49 | 4.95 ± 1.20 | 2.00 ± 0.71 | 3.45 ± 0.59 | 3.90 ± 1.79 | 4.30 ± 1.49 | ||
CCAR-121(Group q flies the round trip) | 2.75 ± 0.54 | 4.15 ± 0.91 | 2.75 ± 0.43 | 5.00 ± 0.89 | 2.25 ± 0.77 | 3.55 ± 0.59 | 2.45 ± 0.92 | 5.10 ± 0.77 | ||
Cruising | – | Pre | SF-S | SF-E | Post | Pre | SF-S | SF-E | Post | |
Exemption policy (Group j flies the outbound trip; Group l flies the return trip) | 2.45 ± 0.50 | 3.40 ± 0.49 | 4.40 ± 0.49 | 5.15 ± 0.80 | 1.90 ± 0.63 | 2.35 ± 0.48 | 3.40 ± 0.49 | 4.95 ± 0.86 | ||