"Vincent Brannigan" wrote in message
...
Peter Skelton wrote:
On Thu, 26 Mar 2009 15:11:06 GMT, Vincent Brannigan
wrote:

Curt wrote:
"Vincent Brannigan" wrote in message
...
vaughn wrote:
"Jack Linthicum" wrote in message
...



Compromising control of the rotor sounds like a fatal crash to me. I
have seen military blogs that say that all of the production must
be finished and accepted before the first major
accident can occur. Wishing or making sure?
This is the type of stuff that happens with any new aircraft. We
"learn by doing". With something as complex and as "different" as
the Osprey, we will probably see a significant list of these issues.
And yes, some of them will probably cause accidents before the
learning is all over.

Vaughn



"new" ? any idea how long this sucker has been teething?

First flight was 19 March 1989

20 years ago !!!!!!!!!!!!!!!!!!!!!


Keep making excuses for the turkey

Vince
I guess this means the C-130 a turkey as well. 'course, it's only been
flying since 1956. "Inspections of C-130 Hercules cargo aircraft
... are turning up cracks in the nuts and bolts used to attach the
wings to the planes' fuselages. The order to inspect the fleet came
late Thursday after cracks were found in some upper wing joint barrel
nuts. As a result, the U.S. Air Force has ordered that every C-130
in the nation's 600-plane fleet be checked, which includes the
older..."

the suggestion was that this was a "This is the type of stuff that
happens with any new aircraft"

The C 130 is a quality control issue with a part

"Concerns surfaced March 5 about a particular brand of upper wing
joint barrel nuts used in C-130s to attach the wings to the fuselage.
The barrel nuts supplied by one manufacturer were deemed "suspect"
after routine inspections discovered a potential for stress fractures
in the metal. As a result, the Pentagon mandated a fleetwide
inspection of each plane's 26 barrel nuts and replacement of all nuts
with the faulty design before the planes could fly again."




The V-22 Loose bolts are either a maintenance screw up or a design
problem

On what basis do you reject subspecification manufacture, and
improper original installation?

1) news reports describe "loose bolts" and only in some of the aircraft
in Iraq. Aircraft are rapidly returned to service. No one has suggested
either that the bolts are being replaced or that new or different
installation techniques are being used. Either the bolts are kept in
inventory, in which case checking and replacing is maintenance. Or they
are not a routine inventory item in which case in which case they cannot
be substandard or they would not reuse them. This means they coudl have
a design problem which they don't understand


2) bolt tightness prediction and checking is always a maintenance issue,
and maintenance is specifically designed to check on improper
installation. Many aircraft maintenance procedures are designed to catch
installation errors prior to disaster, These aircraft have been babied
in every possible way. Failure to schedule maintenance at a rate that will
find such a problem is a screw up in an aircraft of this age.



"Two days later, however, a US Marine Corps MV-22 crew in Iraq heard
unusual noises after landing, and discovered four bolts had shaken loose
inside one of the engine nacelles, said a spokesman for the US Naval Air
Systems Command. The missing bolts are supposed to hold in place a fixed
swashplate that transmits flight control inputs governing the V-22’s blade
pitch during helicopter mode, according to NAVAIR.

As a safety precaution, NAVAIR grounded all 73 MV-22s and 11 CV-22s in the
inventory. Loose bolts, although still in place, have been found in three
more of the 76 aircraft inspected through Wednesday morning. All four
affected aircraft were based in Iraq, the NAVAIR spokesman said.
Two of the four aircraft with loose bolts have been repaired and return to
service, along with the 72 other aircraft that cleared inspection, the
spokesman added. Eight more aircraft remain grounded until they can clear
inspection, which is expected by end-week."


NAVAIR is investigating whether defects in either the maintenance,
manufacturing or design of the aircraft are to blame for the bolts coming
loose, the spokesman said.

Vince


Repeat after me, slowly and clearly: "Safety Wire"

Tie those suckers down 'till they can't move a hair!

That (used to be) SOP in the aviation industry.