Project High Wire - AbsoluteAstronomy.com

See also Project High Wire upgrades on F-100s

Project High Wire was an United States Air Force

United States Air Force

The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

modernization programme for selected North American Aviation

North American Aviation

North American Aviation was a major US aerospace manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber, the F-86 Sabre jet fighter, the X-15 rocket plane, and the XB-70, as well as Apollo Command and Service...

F-100Cs, Ds and Fs Super Sabre

F-100 Super Sabre

The North American F-100 Super Sabre was a supersonic jet fighter aircraft that served with the United States Air Force from 1954 to 1971 and with the Air National Guard until 1979. The first of the Century Series collection of USAF jet fighters, it was the first USAF fighter capable of...

that were still in active inventory. It consisted of two detailed modification groups: significant electrical rewiring upgrade

Upgrade

The term upgrade refers to the replacement of a product with a newer version of the same product. It is most often used in computing and consumer electronics, generally meaning a replacement of hardware, software or firmware with a newer or better version, in order to bring the system up to date...

, and heavy aircraft maintenance

Aircraft maintenance

Aircraft maintenance is the overhaul, repair, inspection or modification of an aircraft or aircraft component.Maintenance includes the installation or removal of a component from an aircraft or aircraft subassembly, but does not include:...

and IRANⁱ upgrade. These upgrades began in 1962.

Rewiring upgrade operation consisted of replacing old wiring and harnesses with improved maintainable designs. Heavy maintenance and IRAN included new kits, modifications, standardized configurations, repairs, replacements and complete refurbishment

Refurbishment

Refurbishment may refer to:*Refurbishment *Antiques restoration*Automotive restoration...

F-100Cs

Source: USAF F-100C Super Sabre - Flight Manual - Technical Order Upgrades T.O. 1F-100C(I)-1S-65 2 February 1971

A modification program of changes in maintenance procedures, major
wiring harnesses, IRANⁱ uppgrade, and additional avionics

Avionics

Avionics are electronic systems used on aircraft, artificial satellites and spacecraft.Avionic systems include communications, navigation, the display and management of multiple systems and the hundreds of systems that are fitted to aircraft to meet individual roles...

1968 Basic Upgrades

Improved nose gear ground safety lock instructions
Improved use of 200 US gal (757.1 l). drop tank
Drop tank
In aeronautics, a drop tank is used to describe auxiliary fuel tanks externally carried by aircraft. A drop tank is expendable and often jettisonable...

s and installation on outboard pylons
Restriction on takeoff
Takeoff
Takeoff is the phase of flight in which an aerospace vehicle goes from the ground to flying in the air.For horizontal takeoff aircraft this usually involves starting with a transition from moving along the ground on a runway. For balloons, helicopters and some specialized fixed-wing aircraft , no...

with partially filled 450 US gal (1,703.4 l). drop tanks
Improved use of braking system with thermal expansion after high altitudes to prevent excessive pressure
Pressure
Pressure is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.- Definition :...

s and system failures.
Improve instructions on all ejection seat systems at low altitude bailouts

1970 High Wire Upgrades

A modernization programme of 3 simultaneous

Relativity of simultaneity

In physics, the relativity of simultaneity is the concept that simultaneity–whether two events occur at the same time–is not absolute, but depends on the observer's reference frame. According to the special theory of relativity, it is impossible to say in an absolute sense whether two events occur...

operations: an electrical rewiring operation, and a heavy maintenance improvements and IRAN operations. Also including design changes, safety instructions, aircraft characteristics, normal and emergency operations, and overall aircraft and documentation standardization

Standardization

Standardization is the process of developing and implementing technical standards.The goals of standardization can be to help with independence of single suppliers , compatibility, interoperability, safety, repeatability, or quality....

.
List of changes and rescinded(R):

Loose strap
Strap
A strap, sometimes also called strop, is an elongated flap or ribbon, usually of fabric or leather.Thin straps are used as part of clothing or baggage, or bedding such as a sleeping bag. See for example spaghetti strap, shoulder strap...

end securing
Main gear
Gear
A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. Two or more gears working in tandem are called a transmission and can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine....

tire failure landing
Landing
thumb|A [[Mute Swan]] alighting. Note the ruffled feathers on top of the wings indicate that the swan is flying at the [[Stall |stall]]ing speed...

s
g
G-force
The g-force associated with an object is its acceleration relative to free-fall. This acceleration experienced by an object is due to the vector sum of non-gravitational forces acting on an object free to move. The accelerations that are not produced by gravity are termed proper accelerations, and...

limitations - R
Spin recovery and canopy warning light
Additional information on external store
External storage
In computing, external storage comprises devices that temporarily store information for transporting from computer to computer. Such devices are not permanently fixed inside a computer....

index system
Oxygen mask
Oxygen mask
An oxygen mask provides a method to transfer breathing oxygen gas from a storage tank to the lungs. Oxygen masks may cover the nose and mouth or the entire face...

hose rerouting
Warning light on fuel
Fuel
Fuel is any material that stores energy that can later be extracted to perform mechanical work in a controlled manner. Most fuels used by humans undergo combustion, a redox reaction in which a combustible substance releases energy after it ignites and reacts with the oxygen in the air...

shutoff switch – R
Additional loading configuration for Mk-82
Mark 82 bomb
The Mark 82 is an unguided, low-drag general-purpose bomb, part of the U.S. Mark 80 series. The explosive filling is tritonal.-Development and deployment:...

and Snakeye I (Mk-82 w/drag fins) bombs
"CAUTION" note on tail skid
In-flight refueling ready light
Addition stores index numbers
Landing pattern usage
A/A37U-15 Tow Target index numbers
Turn-and-slip indicator information
Additional store information
Store index numbers for MK-82 bomb with 36 inches (914.4 mm) fuze
Fuze
Fuze Beverage, commercially referred to as just Fuze , is a manufacturer of teas and non-carbonated fruit drinks enriched with vitamins. Currently the brand consists of five vitamin-infused lines: Slenderize, Refresh, Tea, Defensify, and Vitalize...

extender
Store index numbers for Destructor M117D
M117 bomb
The M117 is an air-dropped general-purpose bomb used by United States military forces. It dates back to the time of the Korean War of the early 1950s. Although it has a nominal weight of 750 lb , its actual weight, depending on fuze and retardation options, is around 820 lb . Its explosive content...
Dispensing of C/B munitions – R
Store index numbers airspeed limits for CBU-24
Bomb arming switch information
Salvo
Salvo
A salvo is the simultaneous discharge of artillery or firearms including the firing of guns either to hit a target or to perform a salute.Troops armed with muzzleloaders required time in which to refill their arms with gun powder and shot...

of armed bombs
Flight limits for BLU-52/B bomb (chemical)
BLU-32/B Fire Bomb un-finned
Modification of oil pressure relief valve
Relief valve
The relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire....
Information of AIM-9E air-to-air missile
Air-to-air missile
An air-to-air missile is a missile fired from an aircraft for the purpose of destroying another aircraft. AAMs are typically powered by one or more rocket motors, usually solid fuelled but sometimes liquid fuelled...
90 degree rotation of A/ARC-34
Information of SUU-20/A Practice Dispenser
Relocation of sight selector unit
Installation of data recording system

1970 High Wire Supplementals

High stresses in the N2 Compressor of the J57-21, -21A engines
Installation of 450 US gal (1,703.4 l). air refueling drop tanks and gauges
Installation of in-flight refueling probe extension
Installation of AIM-9B provisions
Installation of true airspeed indicator
Provisions for in-flight refueling of external tanks
Installation of EPR system
Installation of ILS AN/ARN-31 system
Removal of supplementary oil tank
Standardization of takeoff trim setting
90 degree rotation of AN/ARC-34
installation of canopy breakaway tool
modification of dispenser and rocket system
installation of variable intensity light control
automatic electrical caging – A-4 sight
deactivation of attitude indication system during ground maintenance
installation of fuel system shutoff valve fail light
installation of relay in gun camera circuitry
installation of exterior floodlights
installation of data recording equipment
installation of cockpit selectable hi-lo drag bomb capability
installation of anticollision lights
relocation of variable rocket depression unit
automatic throttle positioning in case of throttle linkage failure
modification of fuel control and addition of extended range afterburner
modification of engine fuel pump transfer valve
modification of oil pressure relief valve

1971 High Wire Supplementals

Information on arresting systems and approach end engagements
Information of fuel system shutoff valve
Flight limits on SUU-20/A practice dispensers with BDU-33/B, -33A/B, -33B/B bombs
Information on SUU-20 series
Information on LAU-3 Rocket Launcher
Operating procedures on HBU-2B/A Lap Belt
Information on minimum altitude of attempting an air start
Information on wind-blast injury during ejections
High stresses in the N2 Compressor
Information on pitch damper system deactivation
Information on partially filled 355 US gal (1,343.8 l). and 275 US gal (1,041 l). drop tanks

Block Numbers for C-model High Wire Mods

Project High Wire modifications were extensive and dictated a change in the block number assignment, i.e.: F-100C-10-NH to F-100C-11-NH

Block No.s.......S/N Range......................Block number change

F-100C-1-NA .... AF 53-1709 to –1778 ... F-100C-2-NA

and 54-1740 to –1769

F-100C-6-NA .... AF 54-1770 to –1814

F-100C-11-NH ... AF 55-2709 to –2733

F-100C-16-NA ... AF 54-1615 to –1859

F-100C-21-NA ... AF 54-1860 to –1969

F-100C-26-NA ... AF 54-1970 to –2120

Note: NA – Los Angeles, CA and NH – Columbus, OH

F-100Ds and Fs

Source: USAF F-100D,F Super Sabre - Flight Manual - Technical Order: 1F-100D(I)-1S-120 dated 12 January 1970

This project required all new manuals (TOs)^a and incremented (i.e. -85 to -86) block numbers. All later production models, especially the F models included earlier High Wire mods. New manuals included colored illustrations. All manuals will have the Roman numeral (I) added after the aircraft number (i.e. T.O. 1F-100D(I)-1S-120, 12 January 1970

Aprroximately 700 D-models had been modified with Project High Wire.

Base Project High Wire

This upgrade is to provide aircrew

Aircrew

Aircrew are the personnel who operate an aircraft while in flight. The composition of the crew depends on the type of aircraft as well as the purpose of the flight.-Civilian:*Aviator** Pilot-in-command** First officer** Second officer** Third officer...

information on aircraft for installation of Data
recorder (DR) equipment. DR is to record basic information on flight conditions i.e.,
velocity

Velocity

In physics, velocity is speed in a given direction. Speed describes only how fast an object is moving, whereas velocity gives both the speed and direction of the object's motion. To have a constant velocity, an object must have a constant speed and motion in a constant direction. Constant ...

, G-force

G-force

The g-force associated with an object is its acceleration relative to free-fall. This acceleration experienced by an object is due to the vector sum of non-gravitational forces acting on an object free to move. The accelerations that are not produced by gravity are termed proper accelerations, and...

, and altitude

Altitude

Altitude or height is defined based on the context in which it is used . As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The reference datum also often varies according to the context...

. This data will be used to study the results of various mission requirements and determine the effects on the fatigue life of the aircraft structures:

VGH^b A/A24U-10 Recorder
Magnetic tape media

Records during gun firing, store release, in-flight refueling, change in nose gear load switch position
Powered by the primary bus
TRK-77/A24U Accelerometer
VGH REC/LDG POS CONTROL, no cockpit controls

Other 1970 changes

Includes previous T.O. -1S-nnn supplemental upgrades, as nnn listed below:

-119 Relocation of Sight Selector Unit and relocation of Variable Rocket Depression Unit
-118 Information on ECM Pod QRC^c-160-8 (AN/ALQ-87)
-117 Information on variety of ordnance and special stores
-116 Classified
-115 For F-100Fs
-114 Classified
-112 Modified Oil Pressure Relief Valve for J-57
-111 Relocation of Fuel Boost Pump and test switch
-110 CBU-42/A authorization
-109 BLU-32/B Firebomb Unfinned
-108 Information on CBU-37/A

Initial High Wire Upgrades

31 August 1967 - 15 December 1969

A modernization programme of 2 simultaneous operations: an electrical rewiring
operation, and a heavy maintenance improvements and IRAN operations. Also
including design changes, safety instructions, aircraft characteristics, normal and
emergency operations, and overall aircraft and documentation standardization.
List of changes and rescinded(R):

Loose strap end securing
Main gear tire failure landings
G limitations - R
Spin recovery and canopy warning light
Additional information on external store index system
Oxygen mask hose rerouting
Warning light on fuel shutoff switch - R
Additional loading configuration for MK-82 and Snakeye I Bomb
CAUTION note on tail skid
In-flight refueling ready light
Addition stores index numbers
Landing pattern usage
A/A37U-15 Tow Target index numbers
Turn and slip indicator information
Additional store information
Store index numbers for MK-82 with 36 inches (914.4 mm) Fuse Extender
Store index numbers for Destructor M117D
Dispensing of C/B munitions - R
Store index numbers airspeed limits for CBU-24
Bomb arming switch information
Salva of armed bombs
Flight limits for BLU-52/B bomb
BLU-32/B Fire Bomb un-finned
Modification of oil pressure relief valve
Information of AIM-9E air-to-air missile
90 degree rotation of A/ARC-34
Information of SUU-20/A Practice Dispenser

1970 High Wire Supplementals

F-100 "G" restrictions
High stresses in the N2 Compressor of the J57-21, -21A engines
Installation of 450 US gal (1,703.4 l). air refueling drop tanks and gauges
Installation of in-flight refueling probe extension
Installation of AIM-9B provisions
Installation of true airspeed indicator
Provisions for in-flight refueling of external tanks
Installation of EPR system
Installation of ILS AN/ARN-31 system
Removal of supplementary oil tank
Standardization of takeoff trim setting
90 degree rotation of AN/ARC-34
installation of canopy breakaway tool
modification of dispenser and rocket system
installation of variable intensity light control
automatic electrical caging - A-4 sight
deactivation of attitude indication system during ground maintenance
installation of fuel system shutoff valve fail light
installation of relay in gun camera circuitry
installation of exterior floodlights
installation of data recording equipment
installation of cockpit selectable hi-lo drag bomb capability
installation of anticollision lights
relocation of variable rocket depression unit
automatic throttle positioning in case of throttle linkage failure
modification of fuel control and addition of extended range afterburner
modification of engine fuel pump transfer valve
modification of oil pressure relief valve

1971 High Wire Supplementals

Information on arresting systems and approach end engagements
Information of fuel system shutoff valve
Flight limits on SUU-20/A practice dispensers with BDU-33/B, -33A/B, -33B/B bombs
Information on SUU-20 series
Information on LAU-3 Rocket Launcher
Operating procedures on HBU-2B/A Lap Belt
Information on minimum altitude of attempting an air start
Information on wind-blast injury during ejections
High stresses in the N2 Compressor
Information on pitch damper system deactivation
Information on partially filled 355 US gal (1,343.8 l). and 275 US gal (1,041 l). drop tanks

Block Numbers for D-model High Wire Mods

D-model High Wire modifications were also performed on A-models and previously upgraded C-models. Most D-model modifications mandated the change in the block number of the aircraft; thus increasing the block number by one unit value, i.e.: F-100D-10-NH to F-100D-11-NH.

Serial Number Information:

Block No.s......S/N Range......Block number change

YF-100A-NA....52-5754/55

F-100A-01-NA 52-5756 ~ 5765

F-100A-05-NA 52-5766 ~ 5778

F-100A-10-NA 53-1529 ~ 1568

F-100A-15-NA 53-1569 ~ 1608

F-100A-20-NA 53-1609 ~ 1708

F-100C-01-NA 53-1709 ~ 1778..F-100C-02-NA (See F-100C High Wire Descriptions)

F-100C-05-NA 54-1740 ~ 1769..F-100C-06-NA

F-100C-10-NA 54-1770 ~ 1814..F-100C-11-NA

F-100C-15-NA 54-1815 ~ 1859..F-100C-16-NA

F-100C-20-NA 54-1860 ~ 1970..F-100C-21-NA

F-100C-25-NA 54-1971 ~ 2120..F-100C-26-NA

F-100C-10-NH 55-2709 ~ 2733..F-100C-11-NA

F-100D-01-NA 54-2121 ~ 2132

F-100D-05-NA 54-2133 ~ 2151

F-100D-10-NA 54-2152 ~ 2221

F-100D-15-NA 54-2222 ~ 2303

F-100D-20-NA 55-3501 ~ 3601

F-100D-25-NA 55-3602 ~ 3701..F-100D-26-NA

F-100D-30-NA 55-3702 ~ 3814..F-100D-31-NA

F-100D-35-NH 55-2734 ~ 2743

F-100D-40-NH 55-2744 ~ 2783

F-100D-45-NH 55-2784 ~ 2863..F-100D-46-NA

F-100D-50-NH 55-2864 ~ 2908..F-100D-51-NA

F-100D-55-NH 55-2909 ~ 2954..F-100D-56-NA

F-100D-60-NA 56-2903 ~ 2963..F-100D-61-NA

F-100D-65-NA 56-2963 ~ 3022..F-100D-66-NA

F-100D-70-NA 56-3023 ~ 3142..F-100D-71-NA

F-100D-75-NA 56-3143 ~ 3198..F-100D-76-NA

F-100D-80-NH 56-3351 ~ 3378..F-100D-81-NA

F-100D-85-NH 56-3379 ~ 3463..F-100D-86-NA

F-100D-90-NA 56-3199 ~ 3346..F-100D-91-NA

F-100F-01-NA 56-3725 ~ 3739..F-100F-02

F-100F-05-NA 56-3740 ~ 3769..F-100F-06

F-100F-10-NA 56-3770 ~ 3919..F-100F-11

F-100F-15-NA 56-3920 ~ 4019..F-100F-16..(~4016)

____________58-6975 ~ 6983

____________59-2558 ~ 2563

F-100F-20-NA 58-1205 ~ 1233..F-100F-21

Total Production 2,294

Note: NA - Los Angeles, CA and NH - Columbus, OH

Footnotes

i. IRAN - Inspection and repair as necessary

a. TO - Technical Orders

b. VGH - Velocity-Gravity-Height

c. QRC - QuickReaction Capability

External links

ThirdWire.com: F-100 Project High Wire

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