NTSB Identification: MKC86MA031.
The docket is stored on NTSB microfiche number 33552.
Accident occurred Monday, November 25, 1985 in DES MOINES, IA
Aircraft: Rockwell 500-S, registration: N81589
Injuries: 7 Fatal.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

N81589 WAS FLWG A BOEING 727 ON ILS APCH IN IFR CONDS. APRX 2.5 MI FM RWY, N81589 SUDDENLY DEVIATED LEFT NRLY 90 DEG. 39 SEC LATER, PLT RPRTD HE ENCTRD SVR TURBC, THEN SAID HE WAS TRYING TO CLB. N81589 SUBSEQUENTLY FLEW THRU TREE TOPS ON RISING TRRN FOR APRX 2 CITY BLKS, THEN HIT PWR LNS & A POLE & CRASHED AGAINST A TREE. NO EVIDENCE OF TURBC DUE TO WX AT/NR APCH ALT. INV SHOWED 4.7 MI SEPN BTN ACFT WHEN THE 727 PASSED THE POINT OF DVN (POD). AT POD, THE 727 WAS ON THE ILS GLIDE SLOPE AT 850'; N81589'S ALT WAS NOT DETERMINED. WND WAS FM 120 DEG AT 3 TO 6 KTS, SHIFTING MORE SOUTHERLY WITHALT. PREVAILING VIS WAS 1/2 MI; RVR FOR RWY 12L WAS 6000'; LGT RIME ICG WAS RPRTD. WITNESSES HEARD PWR INTERUPTION OF 1 ENG AT POD; BUT THERE WAS NO INDCN OF PWR LOSS WHERE ACFT HIT TREES. RADAR DATA SHOWED ACFT SLOWED TO 80 KTS AT POD, ACCELERATED TO 100 KTS DRG DVN, SLOWED TO 70 KTS BFR IMPACT; VMCA WAS 74 KTS. SAFETY BOARD BELIEVES THE PLT MOST LIKELY LOST CONTROL DUE TO SLOW SPD & LGT AIRFRAME ICG; POSSIBLY ENCTRD WAKE TURBC. NO REASON FND FOR LOSS OF ENG PWR.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRSPEED..INADEQUATE..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRCRAFT HANDLING..NOT MAINTAINED..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

WING..ICE


Contributing Factors

AIRSPEED..REDUCED..PILOT IN COMMAND


Contributing Factors

REASON FOR OCCURRENCE UNDETERMINED


Contributing Factors

TERRAIN CONDITION..RISING


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

WEATHER CONDITION..LOW CEILING




Contributing Factors

WEATHER CONDITION..FOG


Contributing Factors

WEATHER CONDITION..RAIN



Contributing Factors

OBJECT..TREE(S)


Contributing Factors

OBJECT..WIRE,TRANSMISSION



Contributing Factors

WEATHER CONDITION..ICING CONDITIONS



Contributing Factors

OBJECT..UTILITY POLE

Index for Nov1985 | Index of months