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RCL divided by its length and expressed as a percentage to the nearest one-tenth of a
percent. The "down" slope and its direction are tabulated in all cases, e.g., "0.8% down
to SE". Where significant slope variations occur, additional data may be shown in notices,
e.g. "E end level, centre section 0.5% down to W, W end 0.1% down to E".
21.2 RWS WIDTH (RWS): is the width FM side to side which contains the RWY, the graded
and ungraded portions of the RWS, shown in metres only. The GRADED portion of the
RWS is defined by boundary markers and is graded to alleviate damage to an ACFT in
the event that it runs off the RWY. The UNGRADED portion of the RWS is free of
upstanding objects but may contain depressions, trenches, etc.
22. ARRESTING SYSTEMS
22.1 Systems other, than those detailed BLW, will be shown as A-Gear and amplified by a
note.
a. Tensioned Hookcable Arresting Systems:
(i) BAK 12 HOOKCABLE AAS. The BAK 12 AAS is a bi-directional hookcable
AAS. Energy is absorbed by a rotary friction braking system which is connected
to the runway hookcable by a nylon tape. MAX tape runout is 365(1200 FT).
MAX energy absorption is 98.5 million FT LB. MNM rebind time is 3 minutes
(nominal). Cycle rate for fighter type ACFT arrests is 12 ACFT per hour
(nominal).
(ii) BAK 14. The BAK 14 is a spring/pneumatic system used for raising and lowering
an AAS hookcable from and into the runway. BAK 14 systems are installed, in
conjunction with BAK 12 hookcables, at YSNW (RWY 08/26 only) YSRI, YWLM,
YAMB, YBTL, YPDN, YPED and YPTN and YPEA. Normally selected up at
departure end for arrestable ACFT OPS. ACFT captains are to request "Cable
Down" or alternatively request "Approach End Cable Up" if required.
CAUTION: In the event of power and or pneumatic failure, APP/DEP end cable will
rise to a height of 100MM (4IN) and remain until failure rectified.
b. Aircraft Arresting Barriers
(i) BEFAB 6:3. Consists of single pressure, pneumatically operated, multidisc
friction brakes and a nylon net suspended between retractable stanchions.
Stanchion erection time is approximately eight seconds. MAX system energy
capacity is 11 Million FT LB.
(ii) BEFAB 21:2. CONSISTS of dual pressure, pneumatically operated, multidisc
friction brakes, a nylon net suspended BTN retractable stanchions and a
computer system which monitors ACFT speed and selects the high pressure
circuit if the ACFT engagement speed is ABV 115KT and the air traffic controller
has selected the `HEAVY' setting on the barrier control panel in the tower.
Stanchion erection time is two seconds System energy capacity:
Low pressure mode (ie, engagement speed BLW 115KT or 'LIGHT' setting
selected by ATC) - 22 Million FT LB.
High pressure mode ('HEAVY' setting selected and engagement speed above
115KT) - 40 Million FT LB.
© Airservices Australia, 2005 Licensed to: Preview Licence MyAIP678901234567890 SeqId
ERSA INTRODUCTION 24-Nov-2005 INTRO - 11
NOTES:
To ensure that BEFAB 6:3 and 21:2 brake cable payout does not occur until
the net has deployed over the engaging ACFT, a shear pin is used to connect
the net suspension cable to the brake cable at each side of the installation.
These pins are intended to fail together shortly after engagement. If, however,
the impact forces at engagement are low it is possible for only one pin to shear.
This could result in the ACFT being yawed and subsequent damage being
caused to it. Although the theoretical MNM engagement speed for both systems
is zero KT, it is, for that reason, desirable to keep engagement speeds ABV
50KT for lightweight ACFT (BLW 60000 LB) and 40KT for heavier ACFT.
Suffix (R) indicates remote control from control tower available.
Barriers are not to be used in winds above 35KTS except in the event of an
EMERG.
c. Flight Manuals.
When RAAF Flight Manuals are amended, this paragraph will refer RAAF OPR to
Flight Manuals for specific speed/weight configuration criteria for individual arresting
systems. Other OPR should refer to their respective Flight Manuals.
d. Arresting System Clearance Details.
The following ACFT are cleared to use the respective arresting systems. (Safebar
engagements are to be made with the canopy closed).
(i) BEFAB 6:3.Canberra, Mirage 111, Mirage F1, Mystere lV, Jaguar, Strikemaster,
Hunter, F5, F104, T33, T37, F111, Hawk 127 and S211. MAX weight speed
limits vary from 10000 LB/160KT to 25000 LB/100KT to 100000 LB/50KT.
(ii) BEFAB 21:2. ACFT types as for BEFAB 6.3. MAX weight/speed limits are:
- For engagement speeds below 115KT-120000 LB/60KT to 30000LB/115KT.
- For engagement speeds above 115KT-65000 LB/115KT to 30000LB/170KT.
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