Deciphering a Complex Document: A Cryptic Text, Slides of Voice

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NATIONAL TRANSPORTATION SAFETY BOARD

Bureau of Technology Washington, D. C.

November 8, 1979

SPECIALIST'S FACTUAL REPORT OF INVESTIGATION COCKPIT VOICE RECORDER

A. ACCIDENT

Lor.ation Date Aircraft Operator Flight No. NTSB No •

Mexico City, Me~ico October 31, 1979 Douglas DC- Western Airlines 2605 DCA Bo-RA-

B. GROUP

Paul C. Turner, National Transportation Safety Board, Chainman George Zurian, Western Airlines, Los Angeles, Member Robert Lindquist, Air Line Pilots Association, Los Angeles, Member J. Jon Huenta, Air line Pilots Association, los Angeles. Member Lloyd F. Wittenburg, Western Flight Operations, Los Angeles, Member Wilford A. Bryde, Douglas Aircraft Company, Los Angeles, t·1ember M. E. Russell, Federal Aviation Adminis~ration, Member

• C. SUM~1ARY

D.

A Fairchild A-100 cockpit voice recorder, S/N 728, was brought to the CVR labroatory by Mexican authorities where the tape was removed and played back. It was found that the tape was partially erased. The transcript was prepared with some difficulty.

DETAILS OF EXAMINATION

A Fairchild A-100 cockpit voice recorder, S/N 728, from Western Airlines flight No. 2605, which crashed on landing at Mexico City, Mexico, was brought to the Audio Laboratory of the National Transportation Safety Board for transcription. The tape was removed from a relatively undamaged recorder. The dust cover and recorder fr4me were bent in and the input plug was jammed into the case. When the tape was played, it was found to have been partially bulk erased and contained a number of rather sharply defined interferring tones. This bulk erasure is being studied for future action. The original was taken to the FBI labs where it was put through a ADAPT filter and highly compressed. The fina, transcript was made from this tape. The transcript, while not entirely complete, represents the best that c011ld be reasonably expected from the tape.

CONT .ROL. CHEC K QUALITY _ ~;v

..;j

The tape channel which was assigned to the flight engineer was found to be inoperative. Additionally, the rronitor headset plug on the CVR, which could be used for selectively monitoring the individual tape channels, was found to have been previou:sly tampered with in a manner to preclude a check of the operation of all channels of the recorder at the unit.

Attachment

~ Paul C. Turner ~ Air Safety Investigator

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CAM-

CAM-

CAM-?

CAM-

·.. (^) '•

INTRA-COCKPIT

TIME &

SOURCE

Report what?

Gotta get up

Fell on the floor

CONTENT

We're about, ah thirty miles

CAM-1 Oh #

lost my revision

::.• F C)~6 : · - ) r.^ --cAM-1^ Thought^ I ::r.

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-. ·.:.--

"

CAM-? * {still to far out) *

CAM-? Why one

21: CAM-

CAM-

CAM-

CAM-

Better put Mexico on two nuh

Yeah

Did

1

~ou hear what the man said

Well let's {start for lower)

• 2 -

·• ·.... ,_:·:T;.;;;;,~~l;~-

AIA·GROUNO COMMUNICATIONS

..TIME &

SOURCE CONTENT

CTR Six zero five, maintain three seven zero

RD0-

R00-

CTR

Estimate * * *

Past Gabby at * * three seven zero

we're estimating *

Two six zero five, report * t hree

forty five

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23:

TIME &

SOURCE

INTRA-COCKPIT

CONTENT

CAM-1 Twenty point one is that i~?

24:

CAM-2 Yeah *

CAM-2 They want us to get hold of Center

CAM-1 Go ahead he said

I· '

. ---·~.-.&. - 3 -

23:

AIR-GROUND COMMUNICATIONS

tiME &

SOURCE CONTENT

RD0-2 Centro Mexico * two six oh five

25: RD0-2 Centro Mexico Western two six zero five

24: RD0-

24: RDO-?

24: RD0-

24: CTR

Central Mexico * * six zero five

(Thanks) Western

Okay Western two six oh five

requesting lower *

Two six oh five is ah, * * radar contact descend to one three thousand * * Tepexpan three zero two zero the altimeter * * expect

• • two three rj,ght

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TIME &

SOURCE

...

INTRA-COCKPIT

CONTENT

CAM ((Sound TP in code))

27: CAM-

CAM-

28: CAM-

28: CAM-

28: CAM-

CAM-?

28: CAM-

CAM-?

Runways two three charlie

Okay *

Got the, got the weather there ah

Yeah * ... --· ... ..... ---~.,.- ·-. G:...thi r ty twenty -.,i ....._ ___...

Zero siz zero * *

I ·..

CTR

RD0-

CTR

RD0-

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AIR-GROUND COMMUNICATIONS

TIME &

SOURCE CONTENT

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Western two six zero five, change to one nineteen seven '

Say again for two six oh five

One nineteen seven

One nineteen seven

---....-----~ ···--- ·--- .· j r

r- ....

TIME &

SOURCE

• ..

INTRA-COCKPIT

CONTENT

CAM-? * * sleep

CAM-

CAM-

CAM-

CAM-

CAM-

CAM-

• • he must of had a nap because

Yeah, there•s the sun coming up *

'feah

Yeah

Gonna be light by the time we get to the blocks

What do you figure our (wait) will be?

CAM-3 No more than an hour or two

32: CAM-

CAM-?

CAM-

I· I · Nice and clear so far down there

(And ah)

Smoke over the city and * *

• 6 -

RD0-

ROO-?

ROO

,....,. ·.

AIR-GROUND COMMUNICATIONS

"TIME &

SOURCE CONTENT

• Mexico Western two six zero five • ·.

• out of two five point five

·. ·.I i

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CAM-

CAM-

CAM-?

CAM-

CAM-

CAM-

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CAM-

33: CJ"1-

ey. ~

()....._

INTRA-COCKPIT

TIME &

SOURCE CONTENT

landing data

· I want to stay, ah I want to stay on INS for a minute here

Yeah, its set

Set right

Okay CDU

Track and groundspeed

Groundspeed

Shoulder harness

On

Right

I think I'm gonna sleep late

• • 1 all.. night * *

I think I got about three hours sleep this afternoon *

'

• 8 -

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AIR-GROUND COIMJNICATIONS _, ,: · ·t{~.: - ?i>

TIME &

SOURCE CONTENT

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TIME &

SOURCE

INTRA-COCKPIT

CONTENT

34:13 f CAM-1 Descend to eleven and cleared for the approach is that correct? ··... !

CAM-3 (^) * * the data Charlie. do you realize do you realize that you're in INS

35: CAM-1 Huh? . CAM ((Sound of altitude alert))

CAM-3 You're in^ Rad^ now^ right

CAM-1 Right

CAM-2 Rig~t '. 35: CAM-3 Just checking up old buddy to make sure that ah the in-range is complete Charlie

• 9 -

34: CTR

34: CAM-

RD0-

CTR

AIR-GROUND COMMUNICATIONS

TIME &

SOURCE CONTENT

Western two six zero five. descend to one one thousand cleared for Tepexpan two three right

* * descend to one one thousand

Western twenty six *

Tepexpan arrival for twenty six oh five sir?

That is correct

'· • I

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CAM

CAM-

CAM-

CAM-

CAM-

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CAM-

CAM-(2) ~ (^) CAM- .Q_

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.•. '•

INTRA-COCKPIT

TIME &

SOURCE CONTENT

((Sound similar to flap handle movement))

·Twenty two

(Okay)

Yeah, you're off (a little b"it)

Change the ADF please to * the outer

Approach checklist

((Sound of code))

Set

Course selectors

Set

((Sound of code ME))

Set l · F1 ight guidance

Flight guidance system

·illllfllili

..

AIR-GROUND COMMUNICATIONS

' TIME &

SOURCE CONTENT

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... - ·.

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INTRA-COCKPIT

ATC ll~f!E'

l)~~.

TIME & SOURCE (^) CONTENT

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38: CAM-1 As desired for now

CAM-3 · Flight mode annu nciators

C~l Ah speed, vertical speed, heading select

38: CAM-

CAM-

CAM-

CAM-

CAM

CAM-

CAM-

Vertical speed --- heading

ADF marker beacon switch

ADF and on

Set right

((Sound of altitude warning horn))

Ins~rument comparison I

• Going, going through one eighty one, eighty ah one sixty ah ten thousand

• 12 -

CTR

RD0-

. ; t,:~~ : .,./ :-y;.~;~~' :·;;" ' .. AIR-GROUND COfMJNICATIONS. · ,.. ·· ' ..

TIME & SOURCE CONTENT

Twenty six zero five change to. tower one eighteen one radar service tenninated

Eighteen one

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CAM-

TIME &

SOURCE

INTRA-COCKPlT

.. I don't have any ah

CONTENT

/~-~~/. ~~1- Thirty five flaps set the bug

:. ~ :· .. ·-· ~

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• ':J.' 0 r- n :r. [TI n ~

~ ~ ~

CAM-1 Check** * Dan

CAM

CAM-?

CAM-

CAM-?

CAM--

w.e::::--- CAM-

CAM

CAM-

40: CAM-

CAM-?

((Sound of marker beacon ME)) ·

Set

It just died

Three green

Spoiler handle

Okay one thirty six

((Sound of racket))

Armed Charlie?

Anned, yeah

• (^) I · '

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AIR-GROUND COMJNJCATJONS. ,, ·

' TIME & SOURCE

.{. 't • • ;; CONTENT ·... ,

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. ~: ~;;~;::: ~!· ~

·-. ·· (-1) inside mike echo (((?tf~1 ,~: ; ··.· -n,J;).. kN.. L '!>iEO ..., ,..

1

~]:~,, ~ "' ~1 40:58 ret ~ i.. l);.. '-f'-'' v TWR &.1 Roger twenty six oh five ah ·t.. ( (^) --u t-,^ ~"~·~^ - e^ ,,w. J^ ·.^ ~;^ ':.^ ·.'· ~ 3 .. ...

J. k^ :

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CAM-

41:

TIME & SOURCE

INTRA-COCKPIT

CONTENT

Set the missed approach altitude heading and

Yeah we know

##track (isn't) working too good

CAM-1 I'll tell ya ____ .... -;__ _

~'p/i/\ ,r/ .''_'>- 41:2 '1 / CAM '-< ((GPWS - glides lope - glide))

. o'V --;;-~ 41:26°'' ~ (^). ··'·''-'·/,'. CAM ~~ (Sound of increasing power)) -··::,-;-·y 4 i'' 41 : 29 _f_ ''h/~ CAM-1 ~Flaps, slats

CAM-

41: CAM-

CAM

The throttles are to # slow -1.;1~~~¢ l'i\1~- ..J/' .....,,.- Set the missed approach hea.di ng and fifteen bank

((Sound of ratchet))

-~· ··----

• 15 -

41: CAM-

AIR-GROUND COMMUNICATIONS

TIME & SOURCE CONTENT

Flight attendants, please be seated and we'd like to thank you all for flying Western

'l ·-!D'/\ /If-. l,"·

You are * * *

Just a little bit (J_t 2fi ;., '71 a.(~ 'biT~'-)

® Advise run'lay in sight there's a

layer of * over the field

,'·"","\·

INTRA-COCKPIT

TIME & SOURCE CONTENT ·... r >-'

• ...<. () 0 'Z - ::>:) 0 r n -::t. <:::J ;"' 1::')l> ~~ C> ·~.:, ...

CAM

CAM-

42:25. CAM-

CAM

CAM-?

CAM

42: CAM-

42: CAM-

CAM-?

:AM-?

((Sound of initial impact))

((Sound of rapid and mixed conversation))

• fly heading

Charlie cut the

((Sound of warning horn))

((Sound of engine buzz saw))

Gear up

You1re banking to the *

•·

17

AIR-GROUND COMMUNICATIONS

TIME & SOURCE CONTENT

; } · -·

42:

TIME & SOURCE

INTRA-COLKPIT

CAM-? Charlie get it up!

CAM-? *

CAM-? Get it up!

CAM-? * *

42:

CONTENT

CAM ((Sound of final impact and end of recording

I· ..

• 18 -

AIR-GROUND COMMUNICATIONS

TIME & SOURCE CONTENT