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(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.
5. CHANGE REF C (F-14D NFM), AS FOLLOWS:
A. CHAPTER 2, PAGE 2-243, PARAGRAPH 2.38 EJECTION SYSTEM, WARNING
AFTER SECOND PARAGRAPH:
(1) DELETE: NA
(2) ADD (INSERT) NEW FIRST BULLET INTO WARNING:
WARNING
REGARDLESS OF THE SJU-17 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 2, PAGE 2-243, PARAGRAPH 2.38.1 EJECTION SEAT, FIRST
PARAGRAPH:
(1) DELETE FIRST THREE SENTENCES.
(2) ADD (INSERT):
AFTER EJECTION HAS BEEN INITIATED, TWO PITOT HEADS MOUNTED
NEXT TO THE PARACHUTE CONTAINER ARE DEPLOYED. AIRSPEED AND
ALTITUDE ARE PROVIDED TO THE BATTERY-OPERATED ELECTRONIC
SEQUENCER MOUNTED UNDER THE PARACHUTE CONTAINER. THE
SEQUENCER USES THE INFORMATION TO DETERMINE THE RELEASE TIME
FOR THE DROGUE BRIDLES, THE DEPLOYMENT TIME FOR THE
PARACHUTE, AND RELEASE TIME FOR THE HARNESS LOCKS.
C. CHAPTER 2, PAGE 2-243, PARAGRAPH 2.38.1.1 SEAT FIRING HANDLE:
(1) DELETE PARAGRAPH.
(2) ADD:
2.38.1.1 SEAT FIRING HANDLE. EJECTION IS INITIATED BY
PULLING UP ON THE SEAT FIRING HANDLE ON THE FRONT OF THE SEAT
BUCKET BETWEEN THE CREWMEMBERS THIGHS. A PULL FORCE OF 25 TO
40 POUNDS IS REQUIRED TO REMOVE THE FIRING HANDLE FROM ITS
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HOUSING. A CONTINUED PULL FORCE OF 30 TO 60 POUNDS IS
REQUIRED TO INITIATE EJECTION. THIS ACTION OPERATES LINKAGE
THAT WITHDRAWS THE SEARS FROM THE TWO SEAT INITIATOR
CARTRIDGES, COMMENCING THE EJECTION SEQUENCE.
D. CHAPTER 2, PAGE 2-248, PARAGRAPH 2.38.1.9 SURVIVAL KIT, THIRD
PARAGRAPH:
(1) DELETE FIRST SENTENCE.
(2) ADD (INSERT):
A URT-33C RADIO LOCATOR BEACON IS IN A CUTOUT IN THE LEFT
THIGH SUPPORT AND IS CONNECTED TO THE COCKPIT FLOOR BY A
STATIC OPERATING CABLE SO THAT IT CAN BE AUTOMATICALLY
ACTUATED DURING EJECTION.
E. CHAPTER 2, PAGE 2-250, PARAGRAPH 2.38.4.1 ELECTRONIC SEQUENCING:
(1) DELETE SUBPARAGRAPHS 1 THROUGH 3.
(2) ADD (INSERT):
1. MODE 1 -- THIS IS THE LOW-ALTITUDE, LOW-AIRSPEED MODE.
THE BRIDLES ARE RELEASED 0.32 SECONDS AFTER SEAT FIRST
MOTION. THE PARACHUTE DEPLOYMENT ROCKET FIRES TO DEPLOY
THE PARACHUTE AND THE HARNESS RELEASE SYSTEM OPERATES TO
FREE THE OCCUPANT FROM THE SEAT.
2. MODES 2, 3, AND 4 -- THESE MODES ARE FOR LOW TO MEDIUM
ALTITUDES. THE SEAT IS DECELERATED BY THE DROGUE AND
AFTER A TIME DELAY DETERMINED BY THE ELECTRONIC SEQUENCER
THE PARACHUTE DEPLOYMENT ROCKET FIRES TO DEPLOY THE
PARACHUTE BEFORE THE DROGUE BRIDLES ARE RELEASED. THE
HARNESS RELEASE SYSTEM OPERATES TO FREE THE OCCUPANT FROM
THE SEAT.
3. MODE 5 -- THIS MODE IS SELECTED AT HIGH ALTITUDE. THE
SEAT (WITH DROGUE BRIDLES CONNECTED) DESCENDS TO 18,000
FEET, WHERE THE BRIDLES ARE RELEASED. THE PARACHUTE
DEPLOYMENT ROCKET FIRES TO DEPLOY THE PARACHUTE AND THE
HARNESS RELEASE SYSTEM OPERATES TO FREE THE OCCUPANT FROM
THE SEAT.
F. CHAPTER 16, PAGES 16-1 AND 16-5, PARAGRAPH 16.1.1 EJECTION
ENVELOPE:
(1) DELETE SECOND PARAGRAPH AND ITEMS 1 THROUGH 3.
(2) ADD (INSERT):
WARNING
DURING EJECTION SEAT DEVELOPMENT AND TESTING, THE
SJU-17(V)3/A AND SJU-17(V)4/A WERE QUALIFIED FOR USE
BY MALE AVIATORS WITH NUDE WEIGHTS FROM 136 POUNDS TO
213 POUNDS. OPERATION OF THE SEAT BY PERSONNEL NOT
　
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