exceptionally demanding operation and requires a thorough flight readiness inspection (PREFLIGHT). The preflight is found in the -10 manual and must be completed prior to each MTF.

Emergency Procedures are found in the -10 or checklist and are not duplicated in this publication.

Prior to each MTF, the pilot will contact maintenance/quality control personnel to determine the maintenance that has been performed.

This manual shall be used only by qualified maintenance test flight pilots as required by AR 95-1

9. System Instruments – Check gage security, static indications, and range markings in accordance with the -10

NOTE

Any round instrument which has a range marking on glass face must also have a white slippage mark from the glass to frame.

11. Flight Instruments – Check instrument security, static instruments and range markings in accordance with the -10

NOTE

Any round instrument which has a range marking on glass face must also have a white slippage mark from the glass to frame.

3.Engine Start 1 WARNING, 2 CAUTIONS

WARNING

Do not have battery on and APU system charging simultaneously for more than 2 minutes. This will prevent an unmonitored battery from overheating and possibly exploding.

 CAUTION

Refer to the -10 for engine starting limits. Abort start if abnormal conditions are noted

CAUTION

In the event of GPU failure during starting, the starter will cease to function and a hot start could occur. Immediately close the throttle, place the BAT switch to BAT and complete abort start procedure. Note peak TOT and record the -13 if TOT limits are exceeded. 

5. Battery switch – BAT (GPU Start) 1 CAUTION

CAUTION

Check GPU disconnected prior to turning the BAT switch on. 

9 CAUTIONS, 11 NOTES

1.  Cyclic Check 1 CAUTION

CAUTION

Limit cyclic to two inches maximum displacement from center

CAUTION

Limit cyclic to two inches maximum displacement from center

CAUTION

Before any movement of controls with the hydraulic system off, both hands must be on the controls.

CAUTION

If a copilot/observer is used, brief not to remove his hand from hydraulic control switch unless instructed to do so. Be prepared for possible up forces on collective. If up forces are excessive, return switch to on. This condition must be corrected before continuing.

NOTE

Feedback forces will be encountered when moving the cyclic stick. If hydraulic servos are functioning properly, negligible forces will be required to maintain a given stick position once the stick is stopped. 

4. Throttle – Slowly increase to full open, 95% N2 RPM….

5. GOV RPM Switch – Carefully increase to 101% to 103%....

CAUTION

Observe engine over speed limitations during steps 4 and 5.

6. Compressor Bleed Valve check 2 NOTES, 1 CAUTION

NOTE

Ensure aircraft and engine are prepared for flight after below check. Ensure all bleed air is off.

NOTE

If FAT is 17 C or higher, it will be necessary to increase helicopter gross weight, not to exceed max gross weight. Due to environmental conditions, it may not be possible to check the valve in the fully closed position

CAUTION

Ensure aircraft and engine are prepared for flight after below check

7. Torsional oscillation check 2 CAUTIONS, 1 NOTE

CAUTION

If torsional oscillation does not dampen by 10 cycles, the throttle will be immediately retarded to eliminate the effect of an unstable N2 governor. If torsional oscillation is not corrected and exceeds 10 cycles, damage to the aircraft may occur.

CAUTION

Brief copilot/observer to guard the pedals by placing his feet approximately 2 inches from the pedals to ensure pilot does not exceed pedal travel limits.

NOTE

Torsional oscillation check must be performed after an engine change, phase inspection, or a change of or adjustment of the engine fuel control, N2 governor, double check valve, accumulators or fuel control air lines.

NOTE

Dual control installation requires an idle speed check from the copilot’s side also. Idle speed may be approximately one-half percent higher on copilot’s twist grip, but not lower.

10. Idle cutoff check 1 CAUTION, 1 NOTE

CAUTION

If throttle is inadvertently rolled to the off position, do not attempt to roll it back on. Perform a hot start emergency shutdown if it appears that TOT limits will be exceeded.

NOTE

Allow TOT to stabilize for two minutes before performing idle cutoff check.

11. Gas Producer Fuel Control Deceleration 1 NOTE

NOTE

Practice and/or retakes may be required before proficiency is obtained in timing the deceleration.

30. HIT Check – Complete 1 NOTE

NOTE

HIT check may be deferred until arrival in test flight hover area if conditions in runup area preclude accurate and/or safe completion of check. HIT check must be completed prior to takeoff.

HOVER CHECKS

3 NOTES, 3 CAUTIONS

1. Takeoff to a Hover 1 NOTE

NOTE

During hover checks, check operation of flight instruments as necessary

4. Slowly hover to test flight area 1 NOTE

NOTE

If HIT check has been deferred, it is required at this time

6. Pylon isolation mount check 1 NOTE

NOTE

The hydraulic caution light may illuminate during this check. This is normal as long as neither the cyclic nor the collective control has any feedback.

8. Power Cylinder Check 1 CAUTION

CAUTION

Brief copilot/observer to hold HYD BOOST switch throughout the following check. Should cyclic jam or become hard to move, instruct copilot/observer to cycle the HYD BOOST switch. If cycling the switch does not release controls, turn HYD BOOST switch off and accomplish hydraulics off landing.

9. Engine Response Check 2 CAUTIONS

CAUTION

Do exceed helicopter limits during power application.

CAUTION

N2 may temporarily overspeed or underspeed the RPM selected for a period of approximately 2 to 5 seconds if the collective is moved abruptly.

BEFORE TAKEOFF CHECKS

1 CAUTION

6. Crew, Mission equipment and Seat belt (inside aircraft) – Check 

CAUTION

Seat belts and shoulder harnesses must also be properly fastened and tightened when seats are no occupied

1.  Takeoff – Perform normal takeoff (500 FPM – 60 KIAS) 1 CAUTION

CAUTION

If excessive vibrations are felt or other indications exist that preclude further safe flight, land and/or return to maintenance area and correct before continuing.

NOTE

Perform checks 3 through 7...

3. Control Rigging Check 1 NOTE

NOTE

Inflight pedal position is an approximate indicator. Primary check for tail rotor rigging will be accomplished before aircraft is released for flight.

4. Autorotation RPM 1 WARNING 1 CAUTION 3 NOTES

WARNING

If autorotation RPM cannot be maintained in the green, terminate the test flight.

CAUTION

Autorotation will be entered at an altitude that will allow power recovery to be completed prior to 500 feet AGL.

NOTE

Ensure engine deice and/or bleed air is off prior to next check.

NOTE

MTF Mission Gross weight – 2700 pounds. ROTOR RPM shall be stabilized at 100% ± 1.4% at the selected baseline DA for your operating area.

NOTE

ROTOR RPM will increase/decrease approximately 1.4% for every 1000 feet increase/decrease in DA or 100 pounds increase/decrease in gross weight.

5. Engine Performance Check 2 CAUTIONS,8 NOTES (5,4,3,2,1,0)

CAUTION

Transient droop may occur and N2 speed may droop below 100% N2. This must recover within 5 seconds.

CAUTION

Do not exceed any operating limitations

NOTE

Environmental conditions may not allow an EPC where maximum power available is less than 100%. If the EPC is deferred, an entry will be made on the -13 with a - stating “Normal EPC deferred until environmental conditions improve.”

NOTE

An EPC is required when

1. 4 fuel control air lines (Pr, Pg, Py, and Pc) are repaired/replaced, loosened or fastened.

2. Removal/installation/reinstallation of the engine.

3. Anytime poor performance is noted.

4. Maintenance on the gas producer fuel control,

5. Maintenance of the governor (GOV) or droop compensator.

6. Maintenance on the 5^th stage bleed valve,

7. Maintenance on the double check valve and accumulators

8. Calibration/replacement of torque or TOT indication system.

NOTE

Maximum power available is achieved when the limits of TOT, torque, or N1 speed are reached at 100% N2

NOTE

Ensure all bleed air systems are off prior to check

NOTE

If weather permits, EPCs should be performed at an altitude that has a predicted maximum torque available of less than 100%

NOTE

1 good landing area will be in reach during the maneuver

NOTE

Use 1 correct chart and the torque required is computed correctly

NOTE

Allow at least 5 minutes at cruise power between EPCs

6. Hydraulic Off Check 1 CAUTION

CAUTION

If a copilot/observer is used, brief not to remove hand from HYD BOOST switch until instructed to do so. If any control problems or abnormal forces are encountered, the copilot/observer should be instructed to place the HYD BOOST switch on. 

8. Flight Instruments Check 1 NOTE

NOTE

Eliminate or minimize all main rotor vibrations prior to the following checks

7. Rotor RPM light and audio check 1 NOTE

NOTE

Raise collective approximately one inch prior to this check

11. Engine Shutdown 1 CAUTION

CAUTION

If throttle is inadvertently rolled to the off position, do not attempt to roll it back on. Perform a hot start emergency shutdown if it appears that TOT limits will be exceeded.

17. Main Rotor Blade – Tie down 1 CAUTION

CAUTION

Do not drop seat belt against side of helicopter. Buckle and bracket will damage honeycomb panel under crewmember door frame.