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Textron Aviation Cessna Citation Longitude

Posted on August 23 2022

Textron Aviation Cessna Citation Longitude user+1@localho… Tue, 08/23/2022 - 21:17

The Cessna Citation Longitude is a super-midsize business jet produced by Wichita, Kansas-based Textron Aviation. Unveiled at the 2012 European Business Aviation Convention and Exhibition (EBACE), the 2-hr., 2-min. first flight of the Longitude took place on Oct. 8, 2016, from the company's Beech Factory Airport, a flight that was performed by an airframe registered as N9722L (Serial No. E700-741001). Less than a month after that first flight, on Oct. 31, 2016, the airframe manufacturer stated that the Longitude would “exceed [the] initial performance targets” announced for the airframe. Following the type’s first flight, the second Longitude airframe—Serial No. 700-0001 and registered as N701GL—made its first flight from the same airport on Nov. 19, 2016, a flight which lasted about 90 min. The 1-hr., 40-min. first flight of the third flight-test airframe took place on March 17, 2017, with the company also stating at that time that the first four production Longitudes were “in progress.” The third flight-test Longitude was Serial No. 700-0002, an airframe that was registered as N702GL. On May 6, 2017, the fourth Longitude flight-test airframe to take part in the flight-test program—Serial No. 700-0003 and registered as N703DL—performed its first flight from Beech Factory Airport, a flight that had a duration of 3 hr., 20 min. In addition to the flight-test airframes, Textron Aviation announced the rollout of the first production Longitude on June 13, 2017, an airframe registered as N704CL (Serial No. 700-0004). Provisional type certification of the Longitude was announced on Dec. 20, 2018, with Textron Aviation’s Model 700 type—Citation Longitude is the commercial designation for that type—subsequently certified by the FAA on Sept. 21, 2019. Following FAA approval of the type, the first Longitude deliveries—of Serial Nos. 700-0008 and -00011—took place on Sept. 30, 2019. 

Cabin

Although Model 700 is certified by the FAA to have as many as 13 seats—for the two required pilots and as many as 11 passengers—the European Union Aviation Safety Agency (EASA) type certificate data sheet (TCDS) increases the number of passengers to 12, matching the maximum passenger capacity promoted by Textron Aviation. When installed, one of those 12 seats can include a jump seat for crewmembers. The Longitude’s passengers are accommodated in a flat-floor cabin that has a length of 25 ft. 2 in., height of 6 ft. and width of 6 ft. 5 in., with that height and width matching the same specifications of the Citation Latitude. The cabin also has “double-club seating” in seats that are “fully berthable” and “designed and built in-house,” and sleeping accommodations for up to four passengers are also possible. Those sleeping accommodations are provided by “[c]onverting facing chairs into lay-flat berths.” According to Textron Aviation, the standard configuration of the Longitude’s cabin has eight seats, with an optional configuration replacing two of the aft seats with a side-facing couch that has three places. Another optional cabin configuration retains the eight club seats of the standard configuration, while adding an additional forward seat that is side facing and which reduces the space available for the galley.

Textron Aviation states that the Longitude’s cabin has a number of attributes that are class-leading, including the amount of legroom and noise in the cabin, as well as the size of the potable-water system. At the time that it was certified in 2019, the cabin sound levels were described as being “nearly twice as quiet” when compared to the “nearest” competing airplane, with the interior sound level being 67 dBA. The double-club configuration that is standard is also marketed as having the largest amount of in-class legroom—11% greater “room than the nearest competitor”—with the legroom noted being 30 in. Located in the forward cabin is a wet galley that is promoted for the space that it provides to prepare food, in addition to other features such as cold storage space, cold and hot water and supply cabinets that are large. Beyond those galley features, a beverage maker and microwave oven are also available as options. Crew and passenger access to the Longitude’s cabin is provided by an airstair that is operated electrically, while another best-in-class cabin feature is the potable-water system, which the company says is the “largest externally serviced potable-water system in its class.” According to the airframe manufacturer, that system provides fresh water to the “galley, vanity and vacuum-assist lavatory.” Also included is a cabin management that is wireless and incorporates “Bluetooth capability,” and certain aspects of the cabin environment and entertainment—such as cabin lighting and temperatures, movies and music and the window shades—can be controlled by passenger’s electronic devices. Additionally, passenger connectivity is enabled through the Longitude’s high-speed internet.

In the aft cabin is a 112-ft.3 walk-in baggage compartment that is certified to accommodate as much as 1,000 lb., and which is heated, pressurized and can be accessed regardless of the airplane’s altitude. Although the “aft-cabin baggage compartment” is approved to that weight, Textron Aviation states that the airplane’s overall baggage capacity weight is 1,115 lb. Around the time that the Model 700 received FAA approval in 2019, it was noted that the “volume and weight capacity” of the baggage compartment represented the highest such figures for airframes in its class. The loading of baggage is marketed as being made easier because of the location of the baggage door on the lower left side of the fuselage, while at the type’s maximum-operating altitude the cabin altitude is 5,950 ft.

Avionics and Flight Controls

Pilots operate the Citation Longitude using Garmin's G5000 integrated flight deck that incorporates three glass displays that measure 14 in. and four touch-screen controllers. Other standard features of the G5000 include very-high-frequency (VHF) aircraft communications addressing and reporting system (ACARS), autothrottles that are fully integrated, diagnostics for maintenance, “synoptics for key systems” and Garmin Synthetic Vision Technology (SVT). Supplementing those standard features are avionics options such as Iridium ACARS, dual LASEREF inertial reference systems, an “enhanced-vision camera,” Future Air Navigation System (FANS) 1/A, a head-up display (HUD) and Link 2000+ controller-pilot datalink communication (CPDLC). The benefits of the “enhanced vision capability” and HUD include allowing for head-up flying that enables the Longitude to have approach minimums that are lower. Another avionics feature is automatic dependence surveillance – broadcast (ADS-B) In and Out capabilities, with the avionics system giving flight crews the ability to perform required navigation performance authorization required (RNP AR) 0.3 nm procedures.

One benefit of the delayed certification of the Model 700 was that it gave Textron Aviation the opportunity “to develop and certify most of the operational capabilities that typically are deferred when a new business jet goes into production.” The capabilities that were operational when the Longitude entered service included the autothrottles, electronic charts, FANS 1/A, approval to conduct localizer performance with vertical guidance (LPV) approaches, synthetic vision primary flight displays (PFD) and XM satellite radio weather. The HUD and enhanced vision system (EVS) options—provided by Garmin and Elbit, respectively—were slated to be approved in 2020, with the former hardware being Garmin’s GHD 2100 HUD.

Described as having a “flight deck [that] is coupled with brake-by-wire and fly-by-wire rudder and spoilers,” the Longitude’s systematic redundancies include a pair of hydraulic systems that are autonomous and independent, and which allow the two pilots to have “backup mechanical control.” When operating in conditions where icing is possible, the ice-detection system detects icing conditions automatically and alerts the pilots when the activation of that systems is required.

Mission and Performance

From a range perspective, the Longitude sits atop Textron Aviation’s Citation product line, offering 800 nm of additional range—as well as additional advertised passenger capacity—in comparison to the Model 680A-based Citation Latitude. Airframes that the Longitude competes with in the super-midsize category of business jets include Bombardier’s Challenger 3500, Embraer’s Praetor 600 and Gulfstream’s G280, as well as Embraer’s Praetor 500 (which, despite having similar specifications, is described as being a midsize business jet).

Comparison: Bombardier Challenger 3500, Citation Longitude, Embraer Praetor 500/600 and Gulfstream G280 Specifications

Citation Longitude

Embraer Praetor 500

Embraer

Praetor 600

Bombardier Challenger 3500

Gulfstream G280

Maximum Passenger Capacity

11*/12**

10

12

16

19

Maximum Range (nm)

3,500

3,340

4,018

3,400

3,600

Engine

Honeywell

HTF7700L (AS907-2-1S)

HTF7500E (AS907-3-1E)

HTF7350 (AS907-2-1A)

HTF7250G

(AS907-2-1G)

Maximum Takeoff Weight (MTOW)(lb.)

39,500

37,567

42,858

40,600

39,600

Exterior Dimensions

Wingspan

68 ft. 11 in.

70 ft. 6 in.

69 ft.

63 ft.

Length

73 ft. 2 in.

64 ft. 7 in.

68 ft. 1 in.

68 ft. 8 in.

66 ft. 10 in.

Height

19 ft. 5 in.

21 ft. 1 in.

21 ft.

20 ft.

21 ft. 4 in.

Interior Dimensions

Length

25 ft. 2 in.

24 ft.

27 ft. 6 in.

25 ft. 2 in.

25 ft. 10 in.

Width

6 ft.

6 ft. 10 in.

7 ft. 2 in.

6 ft. 11 in.

Height

6 ft. 5 in.

6 ft.

6 ft.

6 ft. 1 in.

*FAA TCDS

**EASA TCDS

Performance limitations of the Model 700 include a maximum operating limit speed (MMO) of 0.84 Mach at altitudes greater than 29,375 ft., as well as a maximum operating altitude of 45,000 ft. In addition to that certified MMO, Textron Aviation states that the Longitude’s maximum cruise speed is 483-kt. true airspeed (KTAS). When carrying four passengers and National Business Aviation Association (NBAA) instrument flight rules (IFR) reserves—and operating at 0.80 Mach—the Longitude has a maximum range of 3,500 nm. Noted as being the first business jet produced by Textron Aviation that had transatlantic range, the Longitude’s range was one of the “performance targets” that were announced in October 2016 as exceeding the “initial” figures—the other being the airframe’s full-fuel payload—with that performance figure increased by 100 nm from 3,400 nm to the current 3,500-nm range. When operated at 0.80 Mach but carrying eight passengers, the range is reduced to 3,422 nm. Assuming the airframe’s maximum takeoff weight (MTOW), sea-level altitude and standard conditions, the takeoff field length is 4,810 ft., while the landing distance is 3,170 ft. Furthermore, after takeoff, the Longitude has the ability to climb to flight level (FL) 430 in 20 min.

Variants

Cessna Citation Longitude Specifications

Commercial Designation

Cessna Citation Longitude

Type

Model 700

Maximum Certified Passenger Capacity

11/12

Maximum Range (nm)

3,500

Engine (2X)

Honeywell HTF7700L (AS907-2-1S)

Takeoff/Maximum Continuous Static Thrust Engine Limits (lb.)

7,665/7,428

Basic Operating Weight (lb.)

23,600

Maximum Takeoff Weight (MTOW)(lb.)

39,500

Maximum Landing Weight (lb.)

33,500

Usable Fuel Capacity (gal./lb.)

2,166/14,511

Full-Fuel Payload (lb.)

1,600

Wingspan

68 ft. 11 in.

Wing Area (Ft.2)

537 ft.2

Length

73 ft. 2 in.

Height

19 ft. 5 in.

Honeywell HTF7700L (AS907-2-1S)

The Longitude is certified to be powered by a pair of Honeywell HTF7700L (AS907-2-1S) turbofan engines that have takeoff and maximum-continuous static thrust engine limits—on a standard day at sea-level altitude—of 7,665 lb. and 7,428 lb., respectively. Prior to the Model 700’s first flight in 2016, those engines were noted as being the “the most powerful engines ever fitted to a Citation.” According to FAA TCDS that includes the AS907 variant that uses the HTF7700L commercial designation, that turbofan engine incorporates an annular combustor and single-stage fan, as well as an axial-flow high-pressure compressor that has four stages and a single-stage centrifugal high-pressure compressor. Additionally, the engine’s high- and low-pressure turbines have two and three stages, respectively. That FAA document also states that a full authority digital engine control (FADEC) system controls the power management and fuel control, with the FADEC including “dual-channel electronic control in the form of two electronic control units (ECU).” Marketed by Textron Aviation as saving operators money and time, the Longitude’s engines are further described as being “tuned” for high-altitude and hot-weather conditions.

Citation Longitude Design and Weights

In addition to increasing the Longitude’s range, the full-fuel payload was the other performance target that was announced as exceeding expectations, with that figure increased by 100 lb. from 1,500 lb. to 1,600 lb. The Model 700’s 2,166-gal. (14,511-lb.) usable fuel capacity is carried in two 1,083-gal. (7,255.5-lb.) wing tanks, and the airplane is advertised as able to carry 1,600 lb. of payload when loaded with full fuel. Refueling and defueling is accomplished through a single-point system that lowers the amount of time needed to be spent on the ground, while Textron Aviation states that a panel display negates the requirement for the fuel quantity to be monitored from the flight deck.   

The Longitude’s clean-sheet design is described as incorporating “monolithic-machined structures,” the benefits of which include lowered “assembly cost and time,” part count and weight, as well as improved quality. The airplane’s fuselage is a “conventional aluminum monocoque” which was “adapted” from the fuselage of the Citation Latitude, while the airfoil is “a moderately supercritical, aft-loaded design.” Other features of the Model 700’s wing include a sweep of 28.6 deg., and because the single-piece wing “passes under the fuselage, the structure does [not] intrude into the cabin.”

Citation Longitude Maritime-Patrol Variant

Textron Aviation announced on July 20, 2022, a maritime-patrol variant of the Longitude that is marketed as the Cessna Citation Longitude MPA. The company describes that variant of the type as having performance capabilities that include the previously mentioned range, as well as maximum endurance of eight hours, including a 45-min. reserve.

Equipment installed on the Longitude MPA will include a beyond-line-of-sight (BLOS) fairing, electro-optical/infrared (EO/IR) sensor lift and “a transmissive belly radome for maritime radars,” as well as optional lighting that is night vision goggle (NVG) compatible. According to the airframe manufacturer, the equipment installed—as well as available to be installed—makes the Longitude “ideally suited” for missions that include border patrol, fishery monitoring, search and rescue and “surveillance missions [that occur] over land and water.” The BLOS fairing can accommodate antennas as large as 18 in., while the EO/IR sensor lift allows for sensors that measure as much as 20 in. Another Longitude MPA feature is a “dedicated special-mission electrical power bus.”

Described as having a “lightweight, utility interior,” the ease with which the configuration of the Longitude MPA’s cabin can be changed is also noted by the manufacturer. Beyond the ability to reconfigure the cabin, other interior features include seven passenger seats that are belted, as well as optional mission consoles that enable “operators to process sensor data and stream information.” Located in the forward portion of the cabin is a refreshment center and storage space, with that forward storage area supplemented by additional storage space located further aft in the cabin. Aft of possible mission consoles and additional seating is a lavatory, “belted seat or storage area” and the aft storage area.

Program Status  

At the time of the type’s first flight, Textron Aviation stated that the prototype Longitude airframe would be utilized for performance envelope expansion, with a particular focus on aerodynamics and flight-control testing. The second Longitude to fly was also used for performance envelope expansion; however, its principal role in the flight-test program was the testing of systems. The testing performed by the first two flight-test airplanes was supplemented by the third flight-test airframe which performed tasks such as “collecting flight simulator data,” as well as development of the Longitude’s systems and avionics. The airframe manufacturer stated that the roles of the fourth Longitude included the evaluation of cabin technologies, the environmental-control system and pressurization. Additionally, because it had a cabin interior that was “fully configured,” it was also utilized as a means to “evaluate the fit and finish of the interior.” Following its use in the test program, the fourth flight-test airframe was delivered to a customer on June 29, 2021, while the first production Longitude was previously delivered on Dec. 23, 2019.

At the time it was type certified by the FAA, Textron Aviation noted that the company’s fleet of demo and experimental airframes had compiled nearly “6,000 hours of flight time.” Although Textron Aviation stated in October 2016 that it “expected” the Model 700 to be certified in 2017—and reiterated that timeline when it announced the first flight of the fourth flight-test airframe in May 2017—the type’s certification was delayed by almost “10 months in large part because [the company] had to prove the aircraft meets FAR 25.981 fuel tank explosion prevention requirements without needing a fuel system redesign.”

References

  • AWIN Article Archives
  • ANAC TCDS (EMB-545/-550), EASA TCDS ((Model 700), FAA TCDS (AS907 and Model 700), Transport Canada TCDS (BD-100-1A10)
  • Bombardier, Embraer, Gulfstream Aerospace and Textron Aviation Commercial Materials
Channel
Business Aviation
Market Indicator Code
Business
Category
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10
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Program Profile ID
401470