Boeing E-4 (747) AACP

1st Flight 1973

The Boeing E-4 Advanced Airborne Command Post (AACP), the current “Night Watch” aircraft, is a strategic command and control military aircraft operated by the United States Air Force.

The E-4 series are specially modified from the Boeing 747-200B for the National Emergency Airborne Command Post program.

The E-4 serves as a survivable mobile command post for the National Command Authority, namely the President of the United States, the Secretary of Defence, and successors.

The four E-4Bs are operated by the 1st Airborne Command and Control Squadron of the 595th Command and Control Group located at Offutt Air Force Base, near Omaha, Nebraska.

An E-4B when in action is denoted a “National Airborne Operations Centre”.

Variants

E-4A

Three aircraft produced, powered by Pratt & Whitney JT9D-7R4G2 engines.

No bulge to house equipment on top of fuselage.

These were later converted to E-4Bs.

E-4B

One built and equipped with 52,500-lb CF6-50E2 engines.

Has nuclear electromagnetic pulse protection, nuclear and thermal effects shielding, advanced electronics, and a wide variety of communications equipment.

Specifications

Crew

4

Capacity

Up to 108 mission crew

Length

231 ft 4 in (70.51 m)

Wingspan

195 ft 8 in (59.64 m)

Height

63 ft 5 in (19.33 m)

Wing area

5,500 sq ft (510 m2)

Airfoil

Root

BAC 463 to BAC 468 

Tip

BAC 469 to BAC 474

Empty weight

410,000 lb (185,973 kg)

Gross weight

800,000 lb (362,874 kg)

Max take-off weight

833,000 lb (377,842 kg)

Powerplant

4 × General Electric F103 turbofan engines, 52,500 lbf (234 kN) thrust each

(General Electric CF6-50E2)

Performance

Maximum speed

523 kn (602 mph, 969 km/h)

Cruise speed

483 kn (556 mph, 895 km/h) / M0.84

Range

6,200 nmi (7,100 mi, 11,500 km)

Endurance

150+ hours (with refuelling)

Service ceiling

45,000 ft (14,000 m)

Wing loading

150 lb/sq ft (730 kg/m2)

Thrust/weight

0.26.

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