Tom Carlson, Flightcom's senior electrical engineer, adjusts the configuration on one of Flightcom's wireless ground support headsets
Photo credit: Photo provided by Carl Azar.
Flightcom's wireless headsets offer ramp workers exactly what they need: hands-free mobility; clear team communication; and excellent hearing protection.
Photo credit: Photo provided by Flightcom.
Deicing crews can also use Flightcom's wireless communication system. Maintenance workers are another potential user at the airport.
Photo credit: Photo provided by Flightcom
Simon Broadley, vice president of engineering for Flightcom Corporation, shows the standard wireless pushback system he and his team designed in conjunction with Southwest Airlines.
Photo credit: Photo provided by Chris Hawley.
Michael Walsh, director of business development for Flightcom Corporation, accepts the Product Leaders award at last month's Cygnus Aviation Expo.
Photo credit: Cygnus Business Media
We added a Product Leader category to our popular Ground Support Leaders of the Year awards this year. At last month’s Cygnus Aviation Expo, we officially recognized Flightcom Corporation, Portland, OR, for its wireless ground support communication system.
The company’s headsets – both wired and wireless – are already supporting hundreds of commercial and military flight crews and ground support personnel at more than 40 U.S. airports.
Last December, however, the company won a major contract with Southwest Airlines to provide a wireless ground support system for pushbacks outside Southwest’s 420 gates at 73 airports in 37 states for more than 3,400 flights a day across the United States.
How does the system work? Here’s a basic explanation of its four main components:
- The ComHub: Essentially, the heart of the system. The ComHub connects the pushback driver and the wing walkers to a DECT-based wireless network. During pushback, the ComHub, carried inside a bright yellow weather-resistant bag, is connected to the plane’s interphone so that the driver can talk directly to the flight deck.
- The Wireless Headsets: One for the driver and, typically, two for the wing walkers (although the system can work with as many as four wing walkers). The headsets provide a transmission range of 1,600 feet. A push-to-talk button on the driver’s headset allows for direct communication with the flight deck. Headsets for the wing walkers keep these important guides in continuous communication with the driver on an open mic.
- Waterproof Charging Case: Everything fits into an unbreakable, airtight and dustproof carry case that can easily be wheeled to wherever it needs to be. A convenient, built-in battery charger provides power for all the components. The case easily plugs into a standard AC outlet to provide the headsets with a full charge in two hours that’s good for 24 hours of continuous use. Batteries will stay charged for up to a year, keeping the system “at the ready” whenever it’s needed.
There’s more to the system – and more to its potential aviation uses besides pushing back planes from gates. We talked with a couple of Flightcom executives and here’s what they had to say about what makes the wireless system an award-winner.
On a loud, busy ramp with the pressure always on to make the turn, the difference between costly work injuries and hundreds of thousands of dollars in damage to aircraft is often measured in fractions of a second.
So much the better then, if the entire ground team can hear one another and let their own voices be heard to stop an accident from happening.
“Once we got on the ramp, we realized flat out that there was no good communication system for the entire ground support team,” says Simon Broadley, vice president of engineering for Flightcom.
Before striking the deal with Flightcom last year, Southwest Airlines relied on what most airlines relied on for pushbacks. The pushback driver wore the sole headset that was plugged into the aircraft. Meanwhile, the wing walkers relied on what wing walkers had relied on for the past half century – hand signals.
Hand signals, of course, only work when they can be seen. As Broadley sees it, the wing walker is crucial to a safe pushback, but literally had no voice in the matter without the wireless headsets.
“Wing walkers were living the life of silence,” Broadley says. “They just were not able to have any effective communication. Now, when a wing walker sees a problem, he can say something right away.”
Studies by the Flight Safety Foundation show that human factors are the primary culprit in ramp accidents. Poor communication typically tops the list when things go wrong.
“The wireless system not only enables communication between the flight deck and ground crew,” says Michael Walsh, director of business development for Flightcom, “it optimizes communication by controlling who can talk to whom and under what circumstances.”
All ground personnel, for example, can hear the flight deck on an open mic. But to minimize confusing crosstalk, only the driver can talk directly to the flight deck.
The pilot can also be heard. “We purposefully gave the pilot priority over everyone else to ensure the flight deck could be heard at all times,” Broadley says.
Overall, the system gives the pushback driver the chance to better manage his team during pushback.
“It’s often the case that individual members of the ground crew just focus on their own individual tasks,” Broadley adds. “A driver might be so focused on that towbar, for example, that he doesn’t see the wing walker’s signals. This way everyone can hear and be heard and that really helps make these individuals operate like a real team.”
After the pushback, the driver removes the ComHub from the aircraft (the bag also has a long, red flag that says “REMOVE BEFORE FLIGHT”) and displays it to the flight deck. However, a safety backup built into the system alerts the pilot if the bag remains on the plane.
One key to the Flightcom system is in the choice of technology to hear and speak without the wire. A wireless system transmits voices largely in one of two ways – either by incorporating DECT (Digitally Enhanced Cordless Telecommunications) or Bluetooth.
“The first forays with wireless systems on the ramp used Bluetooth technology,” Broadley explains.
But there are drawbacks to Bluetooth.
“Bluetooth is meant for close communications,” he adds, “typically about 300 feet.”
Bluetooth transmissions are also subject to interference from other communication devices – especially those operating on the 2.4 GHz or 5 GHz frequencies – and can even be blocked by physical barriers – something there’s quite a lot of on the ramp.
DECT, on the other hand, can offer better coverage than Bluetooth. The range of transmission can extend to 1,600 feet. The Flightcom system also uses DECT 6.0 and is less subject to interference in the 30 MHz to 1.8 GHz frequencies. What’s more, DECT can bounce its signal up, over and around objects to establish the best connection.
Flightcom’s wireless system is also full-duplex – meaning it allows communication in both directions simultaneously. Full-duplex capability is important for ground support communication since it lets all personnel speak and hear others at the same time, much like a telephone.
Half-duplex systems, such as walkie-talkies, allow communication in both directions, too – but only one direction at a time. If one person is transmitting, all other transmissions are blocked until the first transmission is over.
While the wireless headsets can be viewed as merely a better way to communicate on the ramp, Flightcom’s equipment also provides excellent hearing protection. OSHA regulations require hearing protection when the time-weighted average noise level exceeds 85 decibels.
A Noise Reduction Rating is a measurement that’s also in decibels. Simply subtract the NRR from the average noise level, and users can tell how much hearing protection they’ll get. Flightcom headsets are rated at 26 decibels. So, if noise levels on the ramp work out to 71 decibels, then the headsets cut that noise down to 45 decibels. By comparison, a normal conversation at three feet measures 65 decibels.
And lest we forget to emphasize this point, the Flightcom executives we interviewed reiterated that there’s more than one way wireless equipment can be considered “wireless.” Some wireless headsets, for example, may still require a wire to a radio or a belt pack. In addition, the transmission range for such devices aren’t likely to be as robust compared to the Flightcom system.
“Wires are a real sore spot with airlines since they are always breaking,” Broadley says.
Walsh adds that it’s a question of “when not if,” wired headsets will need to be repaired. He says the repair issue really gets the airlines’ attention when they look at their overall repair costs for wired headsets, whether they’re used for pushback or deicing.
“We’ve seen instances where the same wired headset has been repaired eight to 12 times annually,” Walsh adds, “and the majority of those repairs are either for broken wires or cables.”
Such an after-market installation of wired headsets on deicing equipment, Walsh also notes, is expensive and can be eliminated with a true wireless system.
“And anyone in the bucket loves that they aren’t tethered,” Walsh adds, “and the drivers like the fact that they can get out of the truck and still be in communication.”
The setup is different for deicing operations. A vehicle-mounted base station provides communication between the driver and the deicer. But the system can also be configured to provide push-to-talk communication with ground control or other teams by way of two-way radios.
Walsh also notes that Flightcom’s wireless systems can be used for maintenance as well as pushback and deicing.
In this instance, the ComHub supplies hands-free communication to the maintenance crew, no matter where they’re stationed.
“Our system allows maintenance technicians inside and outside the aircraft to stay in continuous voice contact,” Walsh says, “and that’s a far better alternative than banging on the wall to get someone’s attention. Maintenance personnel also enjoy the ability to communicate in real time during aircraft movement.”