T-28 Pilot Report

 

Flight: 798

Date: 030516

Flight Time: 1.8

Pilot: Tom Warner

Controller: Andy Detwiler

Location: Norman, OK (KOUN)

Mission: Research

 

Computer

Time

Video

Time

Comments

 

174142

Video start

 

4741

Taxi

 

5008

Time check: computer -1 sec from video, video matches atomic clock time

 

5654

Takeoff

 

5900

Instruments on

 

5939

FM on

 

180030

FM off

 

0153

Reboot due to no telemetry data displayed at ops (file problem at ops)

 

0353

Good reboot

 

1446

High blower

 

2340

010 / 19,000 MSL

 

2436

In cloud / light to moderate turbulence

 

2515

Left turn to 300

182557

 

Flash

 

3035

Coming out of cloud

 

3103

Left turn to 150

 

3200

150

 

3308

Out of cloud

 

3437

Begin descent to 14,000 - 16,000 (low blower)

 

3736

070 / 15,500

 

3800

In cloud, light to moderate turbulence

3826

 

Flash

 

3833

Heavy precip, some hail possibly heard on hail mic

3842

 

Abrupt shear (possibly exited updraft)

 

3910

Exit heavy precip

3918

 

Close flash

 

3942

Out of cloud / inch ice

 

4043

120 / 15,000

 

4106

In cloud

 

4220

Downdraft

 

4251

Possible hail

 

4235

125

4611

 

In cloud

 

4800

2,500 foot per minute updraft

 

4824

Out of cloud (strong storm at 12 o'clock)

 

5312

In cloud

 

5348

Strong updraft

 

5424

Possible hail

5434

 

Flash

 

5502

Hail starts

 

5510

Hail, strong updraft, severe turbulence

 

5535

Video plexiglass cracked

 

5820

Reverse course with left turn

 

5940

Direct Norman with left turn to 245

 

190020

Strong updraft

 

0034

Severe turbulence

 

0037

Heavy precip, possible hail

 

0135

Hail

 

0212

Strong turbulent bump

 

0345

Out of cloud

 

0546

RPM fluctuating +/- 100

 

0735

RPM fluctuating +/- 100

 

1008

RPM surge

 

1020

Surge cleared, preceded for a precautionary landing at Shawnee

 

2211

Landing at Shawnee

 

NOTES

 

Duane and Gary came out to Shawnee. We determined that ice ingestion into the carburetor caused the engine/RPM surge. Performed engine run and engine ran normally. Took off and circled above runway. Engine appeared normal, so preceded back to Norman. The flight to Norman was uneventful.

 

Weather

-        Line of storms formed east of Norman on the east/northeast side of an upper level low and later became severe

-        Storms went on to produce tornadoes after T-28 penetrated the most southern storm.

-        3 to 4 close lightning flashes

-        Last storm penetrated was very strong.

o        Encountered severe turbulence, strong updraft and heavy precipitation / hail

-        Surprising little ice accumulation.

 

Maintenance

-        Oil temperature climbed to approximately 100 C on climb out. Decreased 20 - 30 C while in cloud.

-        Video outer plexiglass cover cracked by hail at 185535

-        Padding on some of the safety wires near the cylinder heads was eroded from hail as well as the caulking around the hail sensor

-        Top heater element of HVPS heavily eroded from precip/hail.

-        New metal melted off of right elevator trailing edge from lightning strike

-        RPM and engine surge apparently caused by ice/water ingestion into the carburetor

o        Charlie S. recommends keeping carburetor heat on or applying carburetor heat if engine surging encountered

 

Operations

-        Radio communications were occasionally scratchy and unreadable from ops

-        Was able to proceed independently during periods when radio communications were not possible