Few aircraft in the history of aviation have been so praised
by its pilots who fly them and yet so controversial as the Bell-Boeing V-22
Osprey. A totally revolutionary aircraft, the V-22 Osprey is the world's first
production tiltrotor. The Osprey's outboard wing-mounted nacelles are capable
of rotating from the vertical position for helicopter mode to the horizontal
position for airplane mode. In helicopter mode, the V-22 is capable of taking
off, hovering and landing much as any large multi-engine helicopter. In
airplane mode, the V-22 can fly with the speed and range of a turboprop
airplane. This extraordinary range of capabilities means the V-22 can fly twice
as fast and at least twice as far as any helicopter in the world.
The V-22 fleet already has amassed in excess of 4,000 hours
of flight time since the program's inception in the late 1980s. Extensive
independent and internal program and technical reviews after two accidents in
2000 have brought about improvements in aircraft systems that will be validated
when flight testing resumes in late April. A full range of operational testing
conducted over the next two years will ensure that the V-22 is fully capable
and reliable over the entire range of tactical and support missions, in every
climate and condition, for which it was designed and developed. A recent NASA
report endorsed tiltrotor technology, citing its potential for both military
and civil missions. NASA's support reflects the strong positive interest the
V-22 has generated among nearly every agency, public and private, and
individual with a stake in aeronautics and aviation.
This is not new or experimental technology. Tiltrotors have
been flying for 45 years, spanning three different generations of tiltrotor
aircraft from the first tiltrotor - the XV-3, which first flew in 1956 - to the
XV-15, which first flew in 1977 and is still flying today, to the MV-22, which
made its first flight in 1989, and the Air Force model, the CV-22. There is
even an unmanned tiltrotor - the Eagle Eye UAV - that has been flying successfully
since 1994.
With more than 6,450 flight hours in all types, it is clear
tiltrotors are reliable aircraft - revolutionary, to be sure, but reliable.
More than 350 people have flown tiltrotor aircraft over the years, and all were
impressed with what the technology brings to aviation.
An Increase in Lift Capability
The V-22 Osprey tiltrotor will provide a significant
increase in medium vertical lift capability for the armed forces of the United
States and its allies. It will provide twice the speed and range, and three
times the payload, of the conventional helicopters used by the U.S. Marine
Corps. For the U.S. Special Operations Forces (SOF), it will provide a
capability that does not exist in their present forces, the ability to insert
or extract SOF out to a 500-nautical mile radius of action during one period of
darkness and in any weather. The U.S. Navy will get a multi-mission aircraft
for long-range combat search and rescue, fleet logistics support and special
warfare. Only the tiltrotor provides a vertical lift capability with the speed
and range to meet these multi-service, multi-mission requirements. Its unique
ability to self-deploy worldwide will allow for a more effective and rapid
response to the crises of the 21st century.
The potential of tiltrotor technology to significantly
increase service combat effectiveness is not limited to the basic missions for
which the airplane was designed. In fact, the Osprey will be a catalyst for a
revolution in military affairs that will change the way all services deploy and
operate vertical lift forces. It will support the concept of operations of
widely dispersed, highly lethal long-range maneuver from land or sea.
Additional mission applications such as Air Expeditionary Forces (AEF) support,
Combat Search and Rescue (CSAR), Airborne Early Warning (AEW), Aerial Refueler
and Medical Evacuation are emerging.
With both military and civil applications, tiltrotor
technology, when combined with the worldwide navigation accuracy of GPS, will
allow for safe and efficient air travel, to and from any spot on the earth's
surface without the need for airport runways.
It allows more airport slots and hence, efficiency, for
larger aircraft carrying more passengers. They can be fed by tiltrotors
operating in and out of airports without using runway slots. Furthermore, it
allows air transport to and from places that cannot accommodate an airport such
as mountainous and dense urban areas, islands, etc.
Helicopters have been limited to air speeds of 150 knots,
ranges of 400 nautical miles and altitudes of 10,000 feet. The tiltrotor
expands the helicopter envelope to speeds of 300 knots, ranges of 1000 nautical
miles and altitudes of 25,000 feet. It incorporates the efficiencies of the
turboprop airplane with the versatility of a helicopter - in one aircraft that
needs no runway.
Fifth Years of R&D Recalled
Bell Helicopter Textron Inc., and the Boeing Co. moved
tiltrotor technology into production after nearly 50 years of research and
development. The Bell Boeing Tiltrotor Team formed in 1982 to begin the design
of a new aircraft that would provide new capabilities to meet realistic
challenges of the 21st Century. The V-22 Osprey is the aircraft that has
resulted from the contributions made by thousands of Bell, Boeing and supplier
employees. Tiltrotor technology moves the world into the next millennium and
will change the way the world flies.
Four Engineering and Manufacturing Development (EMD)
Ospreys, aircraft numbers 7-1, completed developmental envelope expansion in
the summer of 1998. They achieved such milestones as a 3.9 g load factor at 260
knots, 60,500 pounds maximum takeoff gross weight, 25,000 feet in altitude, a
maximum speed of 342 knots, night flights using night-vision goggles and
external loads of 10,000 pounds at 230 knots. Aircraft 9 and 10 completed the
last phase of operational testing (OT-IID) prior to operations evaluation
(OPEVAL). Pilots with the test team, along with the Multi-service Operational
Test Team (MOTT) have flown more than 950 hours on the EMD aircraft. V-22s have
flown more than 2,100 hours since first flight in March 1989. Initial sea
trials were flown aboard the USS Wasp (LHD-1) in December 1990 using two full
scale development V-22 aircraft. Sea Trials with the production representative
(EMD) V-22 began in January 1999 aboard the USS Saipan (LHA-2).
The V-22 is operationally effective and operationally
suitable. On Oct. 31, 2000, on board the USS Bataan (LHD-5), The Navy's
Commander, Operational Test and Evaluation Force (COMOPTEVFOR) declared the
V-22 operationally effective and suitable. Since that time maintainability and
reliability improvements have been incorporated in production aircraft based on
the recommendations during the test evaluation and OPEVAL. The V-22 was documented
as the best prepared aircraft in naval aviation history before entering the
OPEVAL phase of testing.
The CV-22 is the first variant of the U.S. Marine Corps
MV-22. It's unique features include additional fuel tanks in the wing for
extended range of more than twice that of the MV-22; a multi-mode radar for
terrain following/terrain avoidance flight, more sensors, radar jamming
equipment and a suite of integrated radio frequency countermeasures. It will
also have an installed refueling probe; a third seat in the cockpit for the Air
Force special operations flight engineer and two and a half times more flare
and chaff rounds. The CV-22 will replace the MH-53J helicopter and augment the
MC-130 fleet in Air Force Special Operations Command, Hurlburt Field, FL. The
V-22 Osprey's multi-mission capabilities will serve both the Air Force and
Marine Corps.
A New Level of Efficiency
Tiltrotor technology is the most outstanding aviation
technology development in the past 50 years - especially from the users' viewpoint,
both military and civil. Its future has no boundary. The V-22 was designed
from the ground up to be a modern self-deployable, shipboard compatible, rugged
combat rotorcraft. It has twice the speed, three times the range and much more
payload than the helicopters it is replacing. It has been designed to combat
the projected threats of the small arms, IR and radar directed missiles. It has
a modern cockpit with state-of-the-art navigation, communication, passive
defense, and threat warning systems.
Its diagnostic and health monitoring systems will reduce its
maintenance to a fraction of that required in today's helicopters. Fail-safe
and crashworthy features have been incorporated to a greater extent than with
any fielded VTOL aircraft for both the cockpit crew and the troops in back.
It is, the team believes, the finest combat assault and
special operations rotorcraft ever built. Unfortunately, many have rushed to
judgment without waiting for fact, or ignoring those that have been presented
to them. Some have offered pure fantasy and some just poorly informed. It is
important to discuss several of these myths and present the facts, as they are
known regarding the V-22:
Issue: Operational Test Waivers: major deficiencies were
waived during the test program.
The V-22 program management requested and received 22
operational test waivers prior to beginning OPEVAL. This is the lowest number
of waivers of any aircraft in recent history. By comparison, the waivers for
two recently acquired aircraft were 59 and 72 waivers respectively. None of the
waivers for the V-22 were safety related and each had a detailed plan in place
to address the resolution/fix for the waived item.
Issue: It has been said that the V-22 is unstable and a
difficult aircraft to fly. That it requires extraordinary skills to
keep the aircraft safely airborne.
Pilots who have flown a tiltrotor will tell you that it is
one of the easiest aircraft to fly that they have ever flown. How can that be?Â
Like every good airplane, it handles predictably, and smoothly, and lives up to
what those who have flown it have said about it. Most are comfortable after
only a few minutes of operation. I have seen non-pilots take an hour of
instruction in the simulator, then land safely on simulated oil platforms at sea.
Issue:Â Deleted Flight Testing.
The "deleted test points" that have been the subject of
press reports represent a fraction of the total test events and "test points"
collected during the Engineering Manufacturing Development (EMD) phase. Test
events are scheduled for each flight, each one containing a specified number of
test points to be collected during the conduct of that event. The purpose is to
identify a safe flight envelope for the aircraft. The developmental test for
the V-22 was comprised of approximately 2,200 test events of which 1,941 where
actually flown. This equates to 90 percent of the data test points and those
that were not flown were approved during modifications to the Test and
Evaluation Master Plan (TEMP). The objective was to identify and document a
safe and conservative flight envelope. That's what was accomplished. This
flight envelope is the normal flight operations performance window such as
speed, angle of bank, rate of descent, etc. Flying the aircraft inside this
envelope ensures the safe operation of the aircraft.
Issue: The V-22 cannot autorotate if it loses both of its
engines.
Again, not true. Autorotations are aerodynamic procedures
that allow rotorcraft to land without benefit of engine power. The typical
reasons for autorotations are loss of tail rotor or total engine failure. The
V-22 is not a helicopter. It does not autorotate like a helicopter. It is a
tiltrotor, and thus autorotates like a tiltrotor. Rates of descent and
touchdown speeds are different for each helicopter based on weight and other
characteristics of the aircraft. There are approved procedures in the NATOPS
Manual for emergency landings when the nacelles are in the helicopter mode or
the airplane mode.
Issue: The V-22 cannot do external lift operations and ground
personnel cannot work under it while in hover because of its high downwash.
Well, the first statement is absolutely untrue, of course.
The V-22 has a different downwash pattern than the two aircraft it is replacing
for the Marine Corps and the helicopter it replaces in the Air Force Special
Forces. This required a modification to the procedures for approaching and
working under the aircraft - changes that have been implemented and work. The
V-22 has demonstrated external sling load operations up to 11,700 pounds (1,700
lbs above the threshold requirement) over 50 miles with no difficulty.
Issue:Â The V-22 is susceptible to Vortex Ring State
Every rotorcraft is susceptible to Vortex Ring State (VRS).
It can occur at very low forward airspeed and very high rates of descent (less
than 40 knots and greater than 800 feet per minute rate of descent). Flight
restrictions prohibit operations in this regime for the V-22 and all
rotorcraft. Based on test data, current restrictions are very conservative and
provide a very large margin for safety. These "restrictions" are part of the
normal flight envelope as developed in the initial flight test. Follow-on High
Rate of Descent (HROD) testing is approximately 40 percent complete and is
expected to conclude during CY 02.
Issue: The V-22 cannot operate in icing conditions.
The V-22 has been successfully tested in artificial icing
conditions behind a KC-135 tanker spray rig in airplane mode and behind a CH-47
helicopter icing spray rig in helicopter mode. The weather became too warm to
continue the test once. Natural testing is planned for this coming winter.
Issue: The V-22 Osprey is unable to fulfill Marine Corps
requirements.
The aircraft can fly faster further, and with a greater
payload than the requirements laid out in the Operational Requirements Document
(ORD). The aircraft can and has carried 24 combat loaded Marines. Production
representative Osprey aircraft carried an external load, which was 1700 lbs
more than the ORD requirement. The Osprey also demonstrated the ability to
self-deploy 2100 nm, four hours faster than the ORD requirement. The
COMOPTEVFOR report cited 11 enhancing characteristics of the V-22, all of which
are unattainable using helicopter technology. The director of operational test
and evaluation stated in the beyond low rate initial production report, "In the
planning and execution of missions, these three improved characteristics of
range, speed, and payload can be interchanged and utilized in countless ways.
Together they provide a major step ahead in tactical flexibility." The
capability to self-deploy will provide the tactical commander flexibility in
combat never before experienced." This is a tough airplane - nothing fragile
about it - designed to be survivable in combat.
Issue: The V-22 is unaffordable and there are cheaper alternatives.
As far as "cheaper alternatives," 17 separate Cost and
Operational Effectiveness Analyses (COEAs), Analyses of Alternatives (AoAs) and
studies indicated that no helicopter, or mix of helicopters, could meet either
the Marine Corps' Operational Maneuver from the Sea (OMFTS) mission or the
Special Operations Forces (SOF) mission. They all said that the V-22 was the
most cost effective solution. I believe the so-called alternatives also risk more
lives of marines, special operation forces and the people they are to protect
or rescue. They simply cannot do the mission. Why would anyone even suggest
that they continue to do this mission with the limitations of yesterday's
helicopter technology? V-22 is the most cost-effective solution.
In 17 separate COEA studies conducted by the U.S.
government, the V-22 came out the number-one solution. Tiltrotor technology has
not been the cause of either of the mishaps last year (April or December.)Â Any
loss of life is a tragedy in peacetime. However, history tells us that every
new program has gone through pain. Over time we learn about the aircraft and
how to utilize it. In 2001, two separate independent investigative bodies, the
Secretary of Defense's Blue Ribbon Panel (independent review panel) and the
National Aeronautics and Space Administration (NASA) completed exhaustive
studies into tiltrotor technology. Both organizations, comprised of the world's
leading aerospace engineers, declared tiltrotor technology to be sound. The
team believes in this technology. It will be good for the nation in civilian
roles as well as the military.
Robert R. Leder is communications director for the V-22
Joint Program Office at NAS Patuxent River, MD.