PPRuNe Forums - Malaysian Airlines MH370 contact lost

that map number you quoted has me wondering whether it is the same area referred to as other official "debris sightings" - I can't believe all of the "bits" in it are wave-tops, it looks like what I would expect a debris field to look like. No doubt I'm wrong though :suspect:

Bleve

28th Mar 2014 00:32

777fly:

Quote:

Aircraft follows Alt Nav manually entered lat/long waypoints

We wouldn't enter waypoints for know places using manually entered lat/long (difficult to remember), we would enter their codes. eg for Penang we would enter 'wmkp' or 'vpg'. Once the aircraft reached that waypoint if no other waypoints were entered into the FMC, the aircraft would continue on the current inbound heading. ie approx SW towards Madagascar.

Tankengine:

Quote:

Or: the aircraft was turned in heading select and simply followed that heading till the end

Once again if a heading was selected for Penang / Langkawi the aircraft would continue SW/W towards Africa.

The available tracking data for MH370 does not support either scenario.

777fly

28th Mar 2014 00:55

Bleve:

In alternate nav the CDUs do not have a navigation database. All new waypoints have to be entered by lat/long.

mm43	28th Mar 2014 01:05

Todays Search Activity

All times Australian Eastern Daylight Time (UTC+11)

Today’s search and recovery operation in the Australian Search and Rescue Region for Malaysia Airlines flight MH370 is now underway.
Search activities today will involve a total of 10 aircraft.
Nine military aircraft will join today’s search. They include two Royal Australian Air Force (RAAF) P3 Orions, a Republic of Korea P3 Orion, a Republic of Korea C130 Hercules, a Royal New Zealand Air Force (RNZAF) P3 Orion, a Chinese military Ilyushin IL-76, a United States Navy P8 Poseidon aircraft, a Japanese coast guard jet, and a Japanese P3 Orion.
One civil aircraft will act as a communications relay in the search area today.
The first aircraft to leave Perth for the search area was the Chinese Ilyushin IL-76 aircraft about 9am.
The Republic of Korea Hercules C130 departed for the search area about 10am.
The RNZAF P3 Orion is scheduled to depart after 11am, followed by the civil jet acting as communications relay.
The Japan Coast Guard jet is scheduled to depart about 1pm.
The Republic of Korea P3 Orion is scheduled to depart about 2pm.
The two RAAF P3 Orion aircraft are scheduled to depart between 1pm and 3pm.
The United States Navy P8 Poseidon and the Japanese P3 Orion are scheduled to depart about 5pm.
A total of five ships have also been tasked to today’s search.

http://amsa.gov.au/media/documents/2...departures.pdf

olasek

28th Mar 2014 01:11

Quote:

Which is precisely why entries made that way under stressful circumstances

you don't get it, the very premise that a pilot would be punching numerous numbers into FMC in such situation is simply ludicrous.

flash8

28th Mar 2014 01:15

It is pure supposition that the FMS was flying the a/c however.

Blake777

28th Mar 2014 01:27

Japanese satellite

A Japanese satellite has photographed about ten pieces of likely debris in the general area, overlapping previous search areas.

The convergence of sightings does give hope that if we can get a full day of searching in, we may pick up some definitive evidence of the aircraft's demise, giving closure to the families.

MH370 Lost in Indian Ocean: Japan satellite images show floating objects - Latest - New Straits Times

porterhouse

28th Mar 2014 01:27

Quote:

It is pure supposition that the FMS was flying the a/c however.

If FMC wasn't flying than even worse - only a human hand (or autopilot in say hdg mode) could guide this flight through such ground track. Every turn would require dialing in a new heading. Someone would have to be awake and concious.

Fris B. Fairing

28th Mar 2014 01:36

Quote:

One civil aircraft will act as a communications relay in the search area today.

Has this been the case all along or is this something new?

500N	28th Mar 2014 01:39

It's the first time I have seen it specifically mentioned but that doesn't say it hasn't occurred before.

Sensible with all the different nationalities involved.

island_airphoto

28th Mar 2014 01:46

The Frequency is 37.5 KHz which is on the Low Frequency LF band 30khz -300khz

NO.

This is SOUND, not radio. This is ultrasonic, i.e. you can't hear it. Your dog can though. This is a SOUND on the low end of what boats use for depth-finding and sonar.

Species Approximate Range (Hz) human 64-23,000 dog 67-45,000 cat 45-64,000

Ian W

28th Mar 2014 01:48

Quote:

Originally Posted by The Ancient Geek (Post 8405536)

Much discussion has centred around heading changes and the complications of entering these into the FMS.

I am not familiar with Boeing practice (777 pilots please comment) but many aircraft have a large 4 position knob on the centre console which simply changes the current heading in 90 degree steps. This is used when flying a holding pattern.

In the event of a depressurisation or other serious event it would make sense to simply turn the knob 90deg right, wait a short time to clear the airway then right again to head for home. No complicated FMS entries required.

Is the heading flown to the Indian Ocean 180deg to a heading which the aircraft would be expected to be flying during its normal route ?.

If the aircraft was flown in any 'heading' mode then it would deviate by a large amount from a straight track due to the large change in magnetic variation. The aircraft was not in heading mode.

To fly a different mode requires specific inputs either track mode or to a specified waypoint. Someone needed to be there to make those inputs after Malaysian radar had lost contact on the westward flying aircraft.

Scissorlink

28th Mar 2014 01:53

Why are the sateliite photo's

A. in Black and white
B. So bad (definition)

Coagie

28th Mar 2014 01:55

Quote:

Sheep Guts: The Frequency is 37.5 KHz which is on the Low Frequency LF band 30khz -300khz

Sheep Guts, that in the RADIO SPECTRUM. A ULB's 37.5 KHz is in the AUDIO SPECTRUM. Basically, it's high AUDIO frequency buzzer. Submarines that can tow a mile long antenna and supply thousands of watts of power can use the low frequency radio waves to communicate under water, but the antenna and power requirement isn't practical for an Underwater Locator Beacon in a sunken aircraft.

rh200

28th Mar 2014 01:58

Quote:

Perhaps the SAR world needs some sort of clearing house, a bit like Chatham House, where information from credible and classified sources can be pooled without disclosing where or how it was obtained. Maybe if this had existed on March 8th we could have saved lives, if there were lives still to be saved.

No SAR goes rather well, they are proffesionel and deal with information given to them authoritys, not media and speculators like on this forum.

It is the only way to go, and yes some of that information will be wrong and will need to change there pattern as more information arises.

Quote:

The Frequency is 37.5 KHz which is on the Low Frequency LF band 30khz -300khz

Frequency Spectrum definitions and description here

:{:ugh: How many times, audio, versus electromagnetic

Bleve

28th Mar 2014 02:08

Quote:

Bleve:

In alternate nav the CDUs do not have a navigation database. All new waypoints have to be entered by lat/long.

OK I'm with you now. I misread that as 'Alternate Route' ie what some of the ill-informed are calling Route 2. My apologies.

iskyfly

28th Mar 2014 02:13

Just heard on the ABC that the PM has announced a shift of search assets based on credible evidence.

(for what its worth).

imaynotbeperfect

28th Mar 2014 02:13

Bad photos ...

Scissorlink

The photos are partially bad because nations don't want others to know just how good their cameras are ...

RifRaf3

28th Mar 2014 02:16

I've said this before. The FMC is not required (and Boeing does not have 90 degree options). In a premeditated event the whole scenario can be done on a mobile phone or ipad using an FMC app, then HDG SEL used to navigate by. It does not need pilot training to do that. Just follow the yellow brick (magenta) road. VNAV is the difficult bit.

ChrisJ800

28th Mar 2014 02:22

I happened to be listening to Oz marine HF frequencies yesterday and seems around every 3 hours there is a pan pan broadcast re MH370 to remind ships entering the area to keep a lookout. Im on the east coast of Oz but the broadcasts were fairly clear.

All times are GMT. The time now is 22:36.

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