EFCTB
The EFCTB is a compact electric and easy to use tester designed for Boeing’s Elevator Feel Computer. The EFCTB has been Designed to support all Boeing aircraft with Elevator Feel Computer and Centering Units including all needed gauges/pumps in one single box.
The Elevator Feel Computer Test Box (full kit) is housed in a mobile weatherproof case fitted with tire wheels. Technicians can stand inside the aircraft to perform the tests.
EFCTB FEATURES
• AIR & HYDRAULIC SUPERVISION IN ONE DEVICE
• ACCURATE AIR PRESSURE REGULATION
• HAND WHEEL ADJUSTMENT, RELIEVING DIAPHRAGM RATED AT 6 PSI
• INTEGRATED PRESSURE RELIEF SAFETY VALVE RATED AT 6 PSI
Compact
The EFCTB is the most compact and lightweight electric tester on the market: all needed gauges/pumps are in a single box. The EFCTB is powered by regular AC in the rear galley of the aircraft, eliminating the need for an external pressure source, as well as keeping the technician safe by removing the need to be behind a running engine on the tarmac. The rugged case and comfortable handle make the EFCTB easy to move and transport (full kit: 26kg/ 57,32 lbs & test box: 6kg/13.22 lbs), making this ideal for portable maintenance applications. Our test box is based on our ADSE 650 which makes it mobile and transportable.
Electric
No need of any external power source. The EFCTB is electric and uses the power from the rear galley.
Safe
The EFCTB is also a more comfortable and safe solution. Technicians no longer have to stay outside the aircraft during the test. Using the EFCTB, technicians can remain inside the aircraft for the duration of the test. The technology and tester are placed in the rear galley. As well, transporting the tester is no longer a hazmat issue, thanks to removal of the external propane tank needed for pressure.
The versatility of the ADSE 650 makes it an air data test set that is suitable for 90% of the different applications on the market today.
With this new solution run you Elevator Feel Computer test from set up to result in two hours.
In addition, to the technical specifications, it is easy to use, lightweight, portable, rugged and allows you to conduct complete Pitot and Static maintenance tests cost effectively. To summarise, the ADSE 650 is arguably the best and most cost effective Test Set for pitot-static checks on the market today.
EFCTB SPECIFICATIONS
MEASUREMENT SPECIFICATIONS
| Function | Range | Accuracy | Max. resolution |
|---|---|---|---|
| Air Pressure | 0 to 10 psi * | +/- 0.1 % of span | 0.001 psi |
| Hydraulic Pressure | 0 to 3000 psi | 1.0% FS; 0.5% RSS | 1 psi |
* for safety limited to 6psi
REGULATION OF PRESSURIZED AIR
- Hand wheel adjustment, relieving diaphragm rated at 6 psi.
SAFETY AGAINST AIR OVERPRESSURE
- Integrated pressure relief safety valve rated at 6 psi.
MAIN FEATURES
- Air & hydraulic supervision in one device
- Accurate air pressure regulation
DELIVERY INCLUDED ACCESSORIES
- EFCTB Unit [00481]
- Power cord – Plug to IEC C13 – 5m (EU[T1-0126]-UK[T1-0127]-CN[T1-0128]-US[T1-0129])
- Hydraulic transmitter x2 [ED-0117]
- Electrical wire x2 [T1-0394]
- Pitot adaptor x2 For Kit 1055.0 [CSA75700HT-3]
- Pitot adaptor x2 For Kit 1055.1 [CSA73703-4-4HT]
- Pitot adaptor x2 For Kit 1055.2 [CSA70727-3]
- Pitot adaptor x2 For Kit 1055.3 [CSA74703-4-4]
- Pitot adaptor x2 For Kit 1055.4 [CSA76703-4-4]
- Pitot hose assembly x1 [EFCTB-11P]
- Pretest pin x2 [9320104]
- Visco drain hose assembly x2 [EFCTB-12P]
- Hose’s grip x1 [BGH1304-4]
- Spares seals kit x1 [EFCTB-000-04]
- Hydraulic transmitter (spares) x2 [ED-0117]
- Lubrication fluid x1 [DG5050]
- Transport Case [1056.0.000]
GENERAL SPECIFICATIONS
| FULL KIT Physical |
Weight: approximately 26 kg Dimensions: (LxHxP) 31.30 x 20.40 x 12.20 in (79.5 x 51.8 x 31 cm) |
| TEST BOXÂ Physical |
Weight: approximately 6 kg Dimensions: (LxHxP) 13.38 x 11.61 x 6.10 in (34.0 x 29.5 x 15.2 cm) Operating -5°C to 50°C (23°F to 122°F) Storage -20°C to +60°C (–4°F to 140°F) (Extanded Range on-demand) |
| External Electrical Supply | 100-240 VAC / 50-60 Hz / 60W |
| Temperature | Operating: +5°C to +40°C ( 41°F to 104°F) Storage: +5°C to +40°C ( 41°F to 104°F) |
| Case | Completely weatherproof, meets EMC requirements MIL STD 462D |
| Calibration | Recommended period 12 months |
| Ease of maintenance | Maintenance limited to calibration, regular external cleaning |
EFCTB F.A.Q
A : On Boeing 737, the FEEL DIFF PRESS indication on the flight control panel can illuminate in the following cases:
(The feel system simulates “actual feel forces” at the control column from the hydraulically supported elevator panels)
- The first one is related to a differential of A & B hydraulic pressures to the elevator feel system. When hydraulic system pressure drops > 25% related to the higher pressure, the FEEL DIFF PRESS light illuminates on the flight control panel with a 30 second delay. The 30 second delay prevents the light from “flickering” when pressure drops in either system by a high demand such as gear selection.
- The second is related to the dynamic air pressure supply to the Elevator Feel Computer. It receives dynamic pressure from the two pitot tubes mounted on either side of the vertical stabilizer. When the computer receives an erratic signal, it’d be the same as the pressure drop and the light illuminates. (failed probe heater and icing conditions)
- The third is related to the Stall Management and Yaw Damper (SMYD), and a so-called Elevator Feel Shift module (EFS), which creates a ±4 times higher forward control column force when approaching the stall region. This force uses a reduced system “A” pressure and when this reducer fails, opening prematurely providing a higher-than-normal A system pressure to the feel actuator, the FEEL DIFF PRESS also illuminates after 30 seconds.
Note on the last system, it’s inhibited <100 ft. RA and AP selected, and when the EFS is not operational.
The EFCTB will detect an obstruction or leak in the system’s pneumatic network (2nd failure case described above).
Then, the device will detect a leak in the hydraulic system (1st case of failure described above).
Finally, it will detect any inconsistency in the pressure build-up slopes of the two hydraulic circuits A and B (which may help identify the 3rd failure case described above).
A: In the toolbox we have a “standard” power supply, 110/230Vac – 50/60Hz. The onboard AC network of an aircraft is 115Vac/400hz.
The prototype test box, that has been tested on site, does in fact, work on 400Hz aircraft power.
A : No. it’s not mentioned within the maintenance task. It should be considered as an internal process that has been requested by our first customer to ensure the device is working correctly. When this auto test is complete and a leak occurs, that means the leak comes from the aircraft system and not from the EFCTB cables.
A : EFCTB is called in Task 27-31-67-700-801, related to Boeing 737-700/800 aircrafts.
AÂ :Â RSS stands for Root Square Sum. This is an alternative method to determine the accuracy of an equipment.
You can find additional information on this alternative method on the web. For example you can have a look at this page:Â https://www.fiveflute.com/guide/introduction-to-root-sum-squared-rss-tolerance-analysis/
