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Voel
17th Sep 2008, 06:34
WERNER MENGES


THE deadly plane crash in Windhoek's Hochland Park area 10 days ago was caused by a "human error" - plastic bags were left over the air intake tubes of the aircraft during a maintenance inspection three days before the accident, according to a first report on the investigation of the incident.

Preliminary findings in the investigation released by the Ministry of Works and Transport yesterday have identified a maintenance inspection that was done on the aircraft three days before it was to crash-land in Hochland Park's Papegaien Road as a pivotal event in the run-up to the crash.
During the inspection a foreign object was left on part of the aircraft's engine, it was indicated.
This oversight later had catastrophic results.
Five Swiss visitors to Namibia were on board the Cessna 210 aircraft, V5-BIG, which was operated by a Windhoek-based air charter company, Wings Over Africa, when it took off from Eros Airport shortly before 09h00 on September 7.
'NO SIGNS' The group's intended destination was Huab Lodge in the Kunene Region.
According to the report released yesterday, the pilot noticed no abnormalities during pre-flight checks and during take-off.
After the take-off, everything was still normal and the pilot retracted the plane's undercarriage according to normal procedure while he also reduced the aircraft's engine power to 2 500 revolutions per minute.
"At about 600 feet to 700 feet above ground level, the engine power faded away without any special noise or warning," it is stated in the Ministry's statement, which was signed by Works and Transport Minister Helmut Angula.
The pilot turned the plane to the left to carry out an emergency landing in Papegaien Road, it is related in the statement.
After making contact with the ground, though, the plane's left wing collided with a streetlight pole, and the aircraft swung forcefully to the left.
It struck the boundary walls of four houses before it came to a rest.
A 44-year-old surgeon from Lausanne in Switzerland, Nicolas Peloponissios, was seriously injured in the crash.
He died in a Windhoek hospital a few hours after the accident.
MAINTENANCE According to the Ministry's statement the aircraft had been scheduled for an inspection with an aircraft maintenance organisation at Eros Airport on September 4.
"During the inspection, the air intake tubes (ducts) were removed, air filters were also removed for cleaning and the engine had to be washed with water," it is stated in the report released by the Ministry.
"As per engineers report, plastic bags were used to cover the air intake tubes (ducts) during the engine cleaning process in order to prevent water from entering the air intake tubes (ducts).
The aircraft was ground run before it was delivered back to the owner (Wings over Africa) on the 5th September 2008.
"Investigations revealed that the human error was a contributing factor to the engine loss of power, which resulted in an emergency landing and a subsequent crash in Hochland Park urban area," it was stated.
The Ministry's spokesperson, Julius Ngweda, confirmed on enquiry yesterday that it was found that the plastic bags had not been removed from the air intake tubes after the maintenance inspection.
The investigation into the accident is continuing, with a full report to be released once it has been completed.
The Hochland Park crash was the fifth serious incident in less than 11 months involving an aircraft that had taken off from Eros Airport.
Since late October last year eight people have lost their lives in three fatal crashes of aircraft that had taken off from that airport.
All but one of these accidents remain under investigation.

prospector
17th Sep 2008, 07:59
Really??? enough air for an engine run up, then a take off run at presumably full power, and then wait till a reduction in power is called for, and then the engine decides it is not getting enough air??

Wyle E Coyote
17th Sep 2008, 16:00
I agree. no air = no enginge running.

Sounds more like the standard Cessna fuel cock position accident to me. There's usually just enough gas in the system to get you airbourne.

Leezyjet
17th Sep 2008, 21:12
Unless the vibration from take off was enough to shake the bag loose and suck it further into the air intake further restricting the airflow ?.

:confused:

babygoose
19th Sep 2008, 15:14
Taxi all the way from the apron to 01 and do runups with the fuel selector closed???NO WAY!been there tried it, and the engine die on you before take-off...matter of fact is that te plastic bags wasn't removed!!! And this is NOT the first time West Air mess up...heared about no hydrolic fluid after MPI,sparkplugs NOT fasten after MPI,oilsump with no bolt after engin change....BUT NO ITS ALLWAYS THE PILOT!moeg vir die k@k

Voel
20th Sep 2008, 15:01
Human error shatters Westair 41-year maintenance record
Written by By Deon Schlechter
Thursday, 18 September 2008

THE 41 year old flawless record of the country’s largest aviation maintenance facility was dealt a severe blow following the investigation into the latest plane crash at Eros Airport.


The investigation uncovered evidence that Westair Maintenance carried out negligent work on the Cessna 210 that went down in Hochland Park in Windhoek, killing one passenger and injuring three others as well as the Swiss pilot. The investigation concluded that engineers did not remove a plastic bag fitted over the air pipes of the ill-fated Cessna engine after carrying out maintenance work, and that blockage in the air system caused the crash.
Owner of Westair, Wolfie Grellmann, told Informanté “it was the worst nightmare of my 43 years in Civil Aviation when the investigation showed that human error in our workshops was responsible for the Cessna 210 crashing after take-off.”

He said Westair had built up an impeccable reputation over 41 years, and assured Informanté that it was not a faulty system that led to the piece of metal being found in the engine of the crashed plane during the initial investigation. “We have been constantly upgrading our maintenance system to adhere to the strict requirements laid down, but one can never rule out the human error. “Not even the most thorough checking system can detect a tiny piece of hidden metal left behind in the engine once it has been sealed. Checking can then only be done on what is visible.

“We adhere to the highest standards in the industry and believe we have a system in place that can detect any faulty workmanship, but there is no detector for the human factor. “No mistake is acceptable, but this kind of thing can happen even when a 100% checklist was performed on maintenance work. It is sad, but unfortunately true.” He said that in 41 years Westair has never been slapped with an insurance claim for sloppy maintenance work.

“What the current crash investigation has revealed is the worst news I have received as owner of this reputable maintenance facility in my career.”
Informanté has meanwhile learned that the Swiss passengers injured in the disaster, are not considering an insurance claim against Westair for negligence.

They have also indicated that they will not issue a statement on what they experienced on their first visit to Namibia. A visitor to their bedsides in the Roman Catholic Hospital in Windhoek told Informanté the injured tourists spoke in high regard of their Swiss pilot, Rene Klum, who also survived the crash.

Aviation inspectors and bystanders at the horrible crash site in Windhoek told Informanté the way Klum handled the emergency and the manner in which he put down the Cessna 210 in a confined space “was nothing short of a miracle.” Informanté has established Klum is an ex-Swiss Air pilot with years of experience in the cockpits of jets as well as single-engine planes like the Cessna 210.

Tom_Kitty
25th Sep 2008, 19:54
At last fingers get pointed in the right direction! Unfortunately it happens too often to simply state "pilot error" as the cause of an accident. As usual our fantastic DCA was not capable to prevent sloppy maintenance by an in-depth audit. Makes one wonder why the Big Mac resigned after this accident ....

As of Westairs maintenace standards ... I have heard stories ... How can they be such a fantastic facility when there are only 5 qualified airplane mechanics? That is including PK and BS ...:confused: The rest of the bunch is working "under supervision". As far as I am concerned drag them to court for involuntary manslaughter ...