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A1-F18EA-NFM-000
V-15-15 ORIGINAL
15.9.1.1 Departure Recovery. Recovery is generally very prompt, on release of the controls. Some
departures, particularly from inadvertent tailslides, may exhibit large transitory sideslips or negative
g rolls prior to positive recovery. In the absence of a steady spin arrow, controls should remain neutral
throughout all such post departure motion, as CAS reliably regains control. Any pilot input will delay
recovery or precipitate further departure. For departure recoveries that stabilize in a negative g stall,
application of aft stick may be used to finish the recovery.
Throughout extensive testing in clean and multiple stores loadings (including full aft CG), no
self-sustaining falling leaf mode has been observed in the F/A-18E/F.
15.9.1.2 Departure Resistance with Lateral Weight Asymmetries. Complying with NATOPS limits
for asymmetric store loadings is required to prevent departures. Aggressive longitudinal maneuvering
above NATOPS AOA limits may result in a yaw departure away from the heavy wing, which cannot be
controlled with lateral stick or pedal inputs. At low airspeed, recovery is immediate when AOA is
reduced below NATOPS limits. At higher airspeed, more violent and sudden departures may occur
with little or no warning when maneuvering aggressively beyond NATOPS limits. In such cases, the
resulting post-stall gyrations rapidly transition to an upright or inverted spin away from the heavy
wing.
15.9.2 Spin. Developmental flight testing of multiple stores loadings indicate that entry into a CAS
spin is unlikely for a symmetrically loaded F/A-18E/F, and then only as a consequence of an aggravated
departure. Asymmetric stores loadings are spin resistant if the AOA limits are observed. Spin recovery
is straightforward and reliable if the OCF procedures are followed and sufficient altitude remains.
During developmental testing, spin recovery was tested extensively for lateral asymmetries up to
14,000 ft-lbs for both spins into and away from the heavy wing. At high lateral asymmetry, the aircraft
is extremely departure resistant within current AOA limits. Exceeding AOA limits with high lateral
asymmetry most likely results in upright spins away from the heavy wing, which has recovery
characteristics essentially identical to the symmetrically loaded airplane. Spin recoveries for less
common upright spins into the heavy wing, and inverted spins, were sometimes delayed due to the
oscillitory nature of the spin.
Spin is confirmed by a steady spin arrow or the presence of a sustained yaw rate, elevated positive
or negative AOA, and airspeed less than 150 KCAS. F/A-18E/F spin arrows very reliably indicate the
appropriate recovery action. While some departures may generate sufficient yaw rate to trip the
command arrow, they are typically self-recovering by the time the arrow is displayed, and the arrow
will quickly disappear. Therefore, with the spin arrow present, a brief hesitation is all that is required
to confirm a steady, valid arrow prior to applying anti-spin lateral stick.
When confirmed, the command arrow indicates the proper control stick position for upright or
inverted spin. For upright spins, the command arrow directs the pilot to apply full lateral stick with the
spin direction. For inverted spins, the command arrow directs the pilot to apply full lateral stick
opposite the spin direction. Recovery begins immediately but may take up to one turn to become
apparent. Recovery from a fully developed spin may include high roll rates with significant negative g
unloads, which, though disorienting and uncomfortable, should be interpreted as a positive indication
of imminent recovery.
15.9.3 OCF Recovery Procedures
*1. Controls - RELEASE, FEET OFF RUDDERS, SPEEDBRAKE IN
If still out of control -
A1-F18EA-NFM-000
V-15-16 CHANGE 1
*2. Throttles - IDLE
*3. Altitude, AOA, airspeed, and yaw rate - CHECK
If command arrow present -
*4. Lateral stick - FULL WITH ARROW
When command arrow removed -
*5. Lateral stick - SMOOTHLY NEUTRAL
When recovery indicated by YAW rate tone removed, side forces subsided, and
airspeed accelerating above 180 knots -
*6. Recover
Failure to ensure all criteria are met may result in departure during
recovery.
Passing 6,000 ft AGL, dive recovery not initiated -
*7. Eject
Post departure dive recovery initiated below 6,000 ft AGL is not assured.
Delaying the ejection decision below 6,000 ft AGL while departed may
result in unsuccessful ejection.
15.9.4 Post Departure Dive Recovery
1. One-g roll to the nearest horizon
2. Throttles - MAX (MIL if altitude not critical)
3. Pull to and maintain 25° to 35° AOA until positive rate of climb established.
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NATOPS Flight Manual 飞行手册 2(55)
