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REGARDLESS OF THE GRU-7A EJECTION SEAT LIMITATIONS,
ANY PERSON WHOSE NUDE BODY WEIGHT IS BELOW 136 POUNDS
OR ABOVE 213 POUNDS IS SUBJECT TO INCREASED RISK OF
INJURY FROM EJECTION.
B. CHAPTER 16, PAGES 16-1 AND 16-3, PARAGRAPH 16.1.1 EJECTION
ENVELOPE, SECOND PARAGRAPH AND ITEMS:
(1) DELETE SECOND PARAGRAPH AND ITEMS 1 THROUGH 3.
(2) ADD (INSERT) WARNING WITH TEXT:
THE ESCAPE SYSTEM WILL FUNCTION UP TO 0.9 IMN OR 600 KIAS,
WHICHEVER IS GREATER. HOWEVER, HUMAN LIMITATIONS ARE MORE
RESTRICTIVE, AS INDICATED BELOW:
WARNING
REGARDLESS OF THE GRU-7A EJECTION SEAT LIMITATIONS,
ANY PERSON WHOSE NUDE BODY WEIGHT IS BELOW 136 POUNDS
OR ABOVE 213 POUNDS IS SUBJECT TO INCREASED RISK OF
INJURY FROM EJECTION.
1. ZERO TO 250 KIAS - SAFE EJECTION (INJURY IMPROBABLE)
2. 250-600 KIAS - HAZARDOUS EJECTION (APPRECIABLE FORCES ARE
EXERTED UPON THE BODY, MAKING INJURY PROBABLE)
3. ABOVE 600 KIAS - EXTREMELY HAZARDOUS EJECTION (EXCESSIVE
FORCES ARE EXERTED UPON THE BODY, MAKING SERIOUS INJURY OR
DEATH HIGHLY PROBABLE)
C. CHAPTER 16, PAGE 16-2, FIGURE 16-1 EJECTION SEAT LIMITATIONS:
(1) DELETE: NA
(2) AT TOP OF PAGE BETWEEN FIGURE TITLE "COMMAND DUAL EJECTION"
AND NOTE, ADD:
GRU-7A EJECTION SEAT(S)
_______________________________________________________________________
CNO 231304Z OCT98 Page 2 of 5 NA 01-F14AAA-1 IC 142
NA 01-F14AAP-1 IC 40
NA 01-F14AAD-1 IC 19
(3) BELOW "EJECTION SEAT - HUMAN FACTORS LIMITATIONS" GRAPH, ADD:
(BULLET) THIS INFORMATION WAS EXTRAPOLATED USING THE GRU-7A
QUALIFICATION WEIGHTS.
(BULLET) THE GRU-7A WAS QUALIFIED FOR USE BY MALE AVIATORS
WITH NUDE WEIGHTS FROM 136 LB TO 213 LB.
(BULLET) THE HUMAN FACTOR LIMITATIONS ARE FOR HIGH SPEED
AERODYNAMIC LOADS ONLY.
D. CHAPTER 16, PAGE 16-3, PARAGRAPH 16.1.1.1 EJECTION AT GROUND
LEVEL/ON DECK:
(1) DELETE FIRST THREE PARAGRAPHS.
(2) ADD (INSERT):
16.1.1.1 EJECTION AT GROUND LEVEL/ON DECK. THE GRU-7A
EJECTION SEAT IS DESIGNED FOR ZERO-ZERO EJECTION CAPABILITY
FOR A MAXIMUM NUDE CREWMEMBER WEIGHT OF 213 POUNDS. AIRCREW
ABOVE 213 POUNDS NUDE WEIGHT HAVE AN INCREASED RISK OF INJURY
DUE TO AN INADEQUATE PARACHUTE RECOVERY ALTITUDE. AT THE
MAXIMUM NUDE WEIGHT OF 213 POUNDS, THE MARGIN OF SAFETY IS
VERY NARROW BELOW 50 KTAS. TAILWIND AND AIRCRAFT
DECELERATION ALSO CONTRIBUTE TO INCREASED INJURY RISK.
FOR AIRCREW BELOW 136 POUNDS, THE ZERO-ZERO EJECTION
PARACHUTE RECOVERY ALTITUDE IS INCREASED. HOWEVER, LIGHTWEIGHT
AIRCREW OCCUPANTS BELOW 136 POUNDS NUDE WEIGHT ARE
SUBJECTED TO HIGHER LOADS AS AIRSPEED INCREASES, ESPECIALLY
AT AIRSPEEDS GREATER THAN 450 KIAS. THE EJECTION SEAT
BECOMES LESS STABLE AND DECELERATION FORCES DURING DROGUE
CHUTE DEPLOYMENT BECOME MORE SEVERE. ANALYSIS HAS SHOWN THAT
LOWERING THE SEAT PRIOR TO EJECTING INCREASES SEAT STABILITY
DURING A HIGH SPEED EJECTION.
(3) RETAIN OLD LAST PARAGRAPH.
4. CHANGE REF B (F-14B NFM), AS FOLLOWS:
A. CHAPTER 2, PAGE 2-152, PARAGRAPH 2.35 EJECTION SYSTEM, WARNING
AT TOP OF PAGE:
(1) DELETE: NA
(2) ADD (INSERT) NEW FIRST BULLET INTO WARNING:
WARNING
REGARDLESS OF THE GRU-7A EJECTION SEAT LIMITATIONS,
ANY PERSON WHOSE NUDE BODY WEIGHT IS BELOW 136 POUNDS
OR ABOVE 213 POUNDS IS SUBJECT TO INCREASED RISK OF
INJURY FROM EJECTION.
B. CHAPTER 16, PAGE 16-1, PARAGRAPH 16.1.1 EJECTION ENVELOPE, SECOND
PARAGRAPH AND ITEMS:
(1) DELETE SECOND PARAGRAPH AND ITEMS 1 THROUGH 3.
(2) ADD (INSERT) WARNING WITH TEXT:
THE ESCAPE SYSTEM WILL FUNCTION UP TO 0.9 IMN OR 600 KIAS,
WHICHEVER IS GREATER. HOWEVER, HUMAN LIMITATIONS ARE MORE
RESTRICTIVE, AS INDICATED BELOW:
1. ZERO TO 250 KIAS - SAFE EJECTION (INJURY IMPROBABLE
2. 250-600 KIAS - HAZARDOUS EJECTION (APPRECIABLE FORCES ARE
EXERTED UPON THE BODY, MAKING INJURY PROBABLE)
3. ABOVE 600 KIAS - EXTREMELY HAZARDOUS EJECTION (EXCESSIVE
FORCES ARE EXERTED UPON THE BODY, MAKING SERIOUS INJURY OR
DEATH HIGHLY PROBABLE)
C. CHAPTER 16, PAGE 16-2, FIGURE 16-1 EJECTION SEAT LIMITATIONS:
(1) DELETE: NA
(2) AT TOP OF PAGE BETWEEN FIGURE TITLE "COMMAND DUAL EJECTION"
AND NOTE, ADD:
GRU-7A EJECTION SEAT(S)
_______________________________________________________________________
CNO 231304Z OCT98 Page 3 of 5 NA 01-F14AAA-1 IC 142
NA 01-F14AAP-1 IC 40
NA 01-F14AAD-1 IC 19
(3) BELOW "EJECTION SEAT - HUMAN FACTORS LIMITATIONS" GRAPH, ADD:
(BULLET) THIS INFORMATION WAS EXTRAPOLATED USING THE GRU-7A
QUALIFICATION WEIGHTS.
(BULLET) THE GRU-7A WAS QUALIFIED FOR USE BY MALE AVIATORS
WITH NUDE WEIGHTS FROM 136 LB TO 213 LB.
　
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