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Incidents related to Issue 3 incidents related to this issue.

Issue: protections may be lost though pilots continue to rely on them (Issue #15)
Description: Reversion to lower levels of automation may disable built-in protections, possibly leading to unsafe conditions if pilots continue to rely on them.

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  2. Accession Number: 357550
    Synopsis: MD80S ACFT IN CLB. PF, FO SWITCHED TO VERT SPD MODE JUST PRIOR TO ALT CAPTURE SO THE ALT RESTR DROPPED OUT AND THE ACFT CLBED THROUGH ASSIGNED BY 250 FT. FO RETURNED ACFT TO ASSIGNED ALT.
    Narrative: ON JAN 1997, FLT FROM DFW TO LAX, FO FLYING. DURING CLBOUT, AUTOPLT ON IAS, JUST PRIOR TO LEVEL OFF AT FL240 AND AFTER ALT CAPTURE FO SWITCHED TO VERT SPD, CAUSING ALT CAPTURE TO DROP AND ACFT WENT THROUGH FL240. FO ENGAGED ALT HOLD, ACFT BALLOONED ABOUT 250 FT HIGH AND WENT BACK TO FL240.

  3.  
  4. Accession Number: 377210
    Synopsis: PIC, PF, DISCONNECTED AUTOPLT ON B767ER OUT OF EDFF AND OVERSHOT HIS ALT OF 16000 FT. PURPOSE OF DISCONNECT WAS TO RETRIM.
    Narrative: I WAS FLYING ON THE CTR JUMP SEAT AS RELIEF PLT ON A B767ER. AFTER 10000 FT, AUTOPLT WAS SELECTED (CAPT FLYING). I WAS DOING FLT PLAN HOW-GOES-IT NUMBERS DURING CLB AFTER 10000 FT AGL. WE WERE TO STOP CLB AT FL160. CAPT DISCONNECTED AUTOPLT TO RETRIM ACFT. AT FL160 NO ATTEMPT WAS MADE TO LEVEL. PNF AND I BOTH CALLED 'LEVELOFF.' CAPT LEVELED ACFT THEN DSNDED BACK TO FL160. MAX ALT NOTED WAS 16300 FT. CTLR SAID NO CONFLICT OCCURRED. REMAINDER OF FLT AND LNDG AT BOMBAY UNEVENTFUL.

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  6. Accession Number: 412420
    Synopsis: B737-500 CREW EXCEEDS 250 KTS BELOW 10000 FT IN IAH AIRSPACE.
    Narrative: APCHING IAH FROM THE NW, WE HAD BEEN CLRED FOR THE COAST ARR, DIRECT TO HOAGI AND ASKED TO KEEP THE SPD UP UNTIL REACHING 10000 FT, AND NOT TO SLOW TO 250 KTS UNTIL THEN. 6000 FT HAD BEEN SET IN THE ALT WINDOW AS THE LOWEST ALT ON THE COAST ARR WHEN WE WERE INITIALLY CLRED FOR THE COAST ARR. WHEN ASKED TO KEEP THE SPD UP, THE FO (HE WAS FLYING) DISENGAGED VNAV AND SELECTED VERT SPD. THIS TOOK PLACE APCHING HOAGI AND JUST PRIOR TO HDOF TO APCH. (AIRSPD 310 KTS, VERT SPD 2000 FPM.) WE HAD THE COMPUTER SET UP FOR THE COAST ARR AND RWY 26. WHEN WE CHKED IN WITH APCH, HE CLRED US DIRECT TO VETTE FOR THE RWY 14L APCH. WE HAD NOT YET REACHED 10000 FT AT HOAGI. BY SELECTING DIRECT TO VETTE AND RWY 14, WE REMOVED THE COAST ARR AND OUR 10000 FT PROTECTION. WHILE THE FO WAS REPROGRAMMING THE COMPUTER, I WAS RETUNING THE ILS AND CHANGING THE INBOUND COURSE ON THE MCP. WE BOTH LOOKED UP AT THE SAME TIME AND WE WERE DOING 310 KTS AT 9000 FT. THE FO DISCONNECTED THE AUTOPLT AND ARRESTED THE DSCNT AND AIRSPD.
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