NTSB: Passenger jet flew 'alongside' private plane

NTSB: Jet pulled 'alongside' small aircraft in March incident By Mike M. Ahlers, CNN STORY HIGHLIGHTSThe March 27 incident was publicized days after it happenedDetails released Friday show planes came within 0.1 miles of each otherIncident happened 11,000 feet over central Florida Controllers asked jetliner to check on small plane unresponsive to radio calls Washington (CNN) -- Acting at the request of an air traffic controller, the pilot of a Southwest Airlines B-737 pulled within one-tenth of a mile of a small, four-seat aircraft last month to check on pilot of the smaller plane, who had not responded to radio calls, the National Transportation Safety Board said Friday.

The March 27 incident was publicized days after it happened, when Federal Aviation Administrator Randy Babbitt suspended the air traffic controller, for "compromising the safety" of the planes' occupants. But the details released Friday for the first time show just how close the two planes came.

According to the NTSB, the planes came within 0.1 miles of each other, far closer then the required separation of three miles. They also were separated by 100 feet in altitude, less than the 1,000 feet required, the NTSB reported.

The incident happened 11,000 feet over central Florida, when controllers at the Central Florida TRACON, a regional radar facility, were unsuccessful in contacting the pilot of the Cirrus SR22, which was en route to Kissimmee, Florida. The plane had been out of radio contact with the Jacksonville Center for more than an hour.

A TRACON controller sought the assistance of Southwest Airlines flight 821, which was then 10 miles from the smaller aircraft, asking the Southwest pilot "to attempt to verify the condition of the occupants" of the Cirrus, the NTSB said. The Southwest pilot "obliged," and controllers guided the jetliner towards the unresponsive plane. A separate radar scope was set up and a single frequency was used by a front-line manager who provided instructions to the Southwest jet.

When the Southwest jet was about five miles from the smaller plane, the pilot reported seeing the plane visually and on a collision avoidance system. The jet "maneuvered on his own alongside of" the smaller plane, the NTSB said.

The crew reported seeing "two occupants in the Cirrus and no apparent movement from them" before being vectored away to its Orlando destination.

The FAA said both planes landed safely. Southwest Airlines reported in March that it had suspended the pilot of the jetliner pending an investigation.

Both the FAA and NTSB are investigating. Neither has issued any findings or conclusions.

Aviation authorities say the protocol for intercepting unresponsive aircraft is to scramble military jets.

"By placing this passenger aircraft in close proximity to another plane, the air traffic controller compromised the safety of everyone involved," FAA Administrator Randy Babbitt said in a statement in March.

"This incident was totally inappropriate." "We are reviewing the air traffic procedures used here and making sure everyone understands the protocols for contacting unresponsive aircraft," Babbitt said.

Southwest Airlines said the flight had 137 passengers and a crew of five.

View the Original article

NTSB: Cracks found in 3 grounded Southwest planes

officials said.

"What we saw with Flight 812 was a new and unknown issue," said Mike Van de Ven, Southwest executive vice president and chief operating officer. He said the airline had complied with federally mandated and Boeing-recommended inspections for the plane.

Federal records show cracks were found and repaired a year ago in the frame of the same Southwest plane.

A March 2010 inspection found 10 instances of cracking in the frame, which is part of the fuselage, and another 11 instances of cracked stringer clips, which help hold the plane's skin on, according to an AP review of FAA records of maintenance problems.

The records for the plane show the cracks were either repaired or the damaged parts replaced. Cracking accounted for a majority of the 28 problem reports filed as a result of that inspection.

It's common for fuselage cracks to be found during inspections of aging planes, especially during scheduled heavy-maintenance checks in which planes are taken apart so that inspectors can see into areas not normally visible.

The Arizona jetliner had gone through about 39,000 cycles of pressurizing, generally a count of takeoffs and landings. Cracks can develop from the constant cycle of pressurizing for flight, then releasing the pressure.

Southwest officials said the plane was given a routine inspection Tuesday and underwent its last so-called heavy check, a more costly and extensive overhaul, in March 2010.

The decompression happened about 18 minutes after takeoff from Phoenix Sky Harbor International Airport.

At cruising altitude of some 34,000 feet, the pilots declared an emergency and briefly considered returning to Phoenix before the cabin crew told them of the extent of the damage, Sumwalt said. The plane's voice and data recorders were being examined in Washington.

Southwest operates about 170 of the 737-300s in its fleet of 548 planes, but it replaced the aluminum skin on many of the 300s in recent years, a spokeswoman said. The planes that were grounded over the weekend have not had their skin replaced.

US Airways operates 18 of the older-model 737-300s, but the company said Monday it has been told by Boeing that its jets aren't affected.

Lufthansa has a fleet of 63 Boeing 737s, including 33 of the 300 series. But just three of those are from the same series as the Southwest jet.

"As a precautionary measure, all three aircraft underwent additional checks over the weekend, which didn't yield any further findings. Accordingly, the aircraft are operating as scheduled," said airline spokesman Martin Riecken. "We are in close contact with Boeing regarding this issue and are awaiting further advice from the manufacturer."

In July 2009, a football-sized hole opened up in-flight in the fuselage of another of Southwest's Boeing 737s, depressurizing the cabin. Sumwalt said the two incidents appeared to be unrelated.

A fuselage failure, although extremely rare, can have deadly consequences. In 1988, cracks caused part of the roof of an Aloha Airlines Boeing 737 to peel open while the jet flew from Hilo to Honolulu. The flight attendant died, and dozens of passengers were injured.

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

For more information about reprints & permissions, visit our FAQ's. To report corrections and clarifications, contact Standards Editor Brent Jones. For publication consideration in the newspaper, send comments to letters

View the Original article

NTSB: Cracks found in 3 grounded Southwest planes

By Nick Oza, The Arizona Republic via AP

Officials discovered cracks in more Southwest jeltiners, and the airline company grounded flights Monday for inspections.

EnlargeCloseBy Nick Oza, The Arizona Republic via AP

Officials discovered cracks in more Southwest jeltiners, and the airline company grounded flights Monday for inspections.

Boeing said Monday that it will issue guidance this week on how airlines should do checks on the affected airplanes now in service.

The 5-foot-long hole tore open Friday in the passenger cabin roof shortly after the Southwest plane carrying 118 people left Phoenix for Sacramento It made a rapid descent, landing at a military base in Yuma, 150 miles southwest of Phoenix. No one was seriously hurt.

Since then, Southwest grounded 79 other Boeing 737-300s and began inspecting them. The grounding caused about 600 flight cancellations over the weekend and another 70 on Monday. Nineteen inspected aircraft showed no problems and will be returned to service.

Checks on the remaining jets are expected to be completed by late Tuesday, the airline said.

READ MORE: Cracks found in Southwest aircraftThe incident raises new questions about the vulnerability of the nation's air fleet to fatigue cracks, more than two decades after cracks caused part of the roof of an Aloha Airlines Boeing 737 to peel open. A flight attendant was sucked out and plunged to her death.

There are 931 737-300 such models in service worldwide, 288 of which are in the U.S. fleet. Boeing said its service bulletin will also require checks on some 737-400 and 737-500 models as well, depending on how many pressurization cycles they have gone through.

The new inspection would be a one-time check, Boeing spokesman Marc Birtel said.

The "service bulletin" Boeing was developing will target all similar 737 models with comparable flight cycle time as the Arizona jet, which was 15 years old and had about 39,000 takeoff and landing cycles, National Transportation Safety Board member Robert Sumwalt said.

The bulletin would outline extensive checks of two lines of "lap joints" that run the length of the fuselage. The NTSB has not mandated the checks, but Sumwalt said the Federal Aviation Administration is likely to make them mandatory.

The NTSB also could issue urgent recommendations for inspections on other 737s if investigators decide a problem has been overlooked. The FAA declined to say if it would require other operators to check their aircraft for similar flaws.

The cracks found in the three Southwest planes developed in two lines of riveted joints that run the length of the aircraft. The agency is focusing its probe on the area of the cracks but has not determined that the cracks caused the rupture.

Two planes have been found with cracks similar to those in the Phoenix aircraft and will be evaluated and repaired before they are returned to service, Southwest said on Sunday in a prepared statement about its inspections. Sumwalt said a third plane had been found with cracks developing.

The NTSB planned a press briefing at 1:30 p.m. PT on Monday.

Previously, the riveted joints were not extensively checked because they were believed not susceptible to fatigue, Sumwalt said.

"Up to this point only visual inspections were required for 737s of this type because testing and analysis did not indicate that more extensive testing was necessary," Sumwalt said. That will likely change after Friday's incident, he said.

The tear along a riveted "lap joint" above the midsection of the plane shows evidence of extensive cracking that hadn't been discovered during routine maintenance

View the Original article