1. FUEL BOOST PUMP CONTROL switches -NO. 1 PUMP and NO. 2 PUMP -ON.

2.
LAND AS SOON AS PRACTICABLE.

Change 4 9-15 TM 1-1520-253-10

b. This portion of the emergency procedure has been written to provide the best method of isolating the cause of the failure and prescribing the proper corrective action when the situation is not critical. This portion of the emer-gency procedure assumes the FUEL BOOST PUMP CONTROL switches are OFF when the malfunction oc-curs.
If the situation is not critical:

ENG FUEL SYS selector on affected engine -XFD.
If legend stays on:

FUEL BOOST PUMP CONTROL switches -NO. 1 PUMP and NO. 2 PUMP -ON.

If legend stays on:

FUEL BOOST PUMP CONTROL switches -NO. 1 PUMP and NO. 2 PUMP -OFF.
4. LAND AS SOON AS PRACTICABLE.

9.26 ELECTRICAL SYSTEM.
9.26.1 #1 and #2 Generator Failure (#1 and #2 CONV and AC ESS BUS OFF Caution Legends On).

SAS 1 switch -Press off.

2. Airspeed -Adjust (80 KIAS or less). GENERATORS NO. 1 and NO. 2 switches -RESET; then ON. If caution legends remain on:

GENERATORS NO. 1 and NO. 2 switches -OFF.
EMER APU START.
SAS 1 switch -ON.

7. LAND AS SOON AS PRACTICABLE.
9.26.2 #1 or #2 GEN Caution Legend On.

When the #1 ac generator is failed, and the backup pump circuit breaker is out, turn off ac electrical power before reset-ting the backup pump power circuit breaker, to avoid damaging the current limiters.

Affected GENERATORS switch RESET; then ON. If caution legend remains on: Affected GENERATORS switch -OFF.

9.26.3 #1 and #2 CONV Caution Legends On.

Unnecessary dc electrical equipment -OFF.
NOTE
When only battery power is available, bat-tery life is about 38 minutes day and 24 min-utes night for a battery 80% charged.
2. LAND AS SOON AS PRACTICABLE.
9.26.4 BATTERY FAULT Caution Legend On.

BATT switch -OFF; then ON.If BATTERY FAULT caution legend goes on, cycle BATT switch no more than two times.
If legend remains on:

BATT switch -OFF.
9.26.5 BATT LOW CHARGE Caution Legend On.
BATT LOW CHARGE caution legend on indicates charge is at or below 40%.
If legend goes on after ground APU start:

9-16

1. BATT switch -OFF; then ON to reset charger analyzer logic. About 30 minutes may be re-quired to recharge battery.
If legend goes on in .ight:

2. BATT switch -OFF, to conserve remaining battery charge.
9.27 HYDRAULIC SYSTEM.
9.27.1 #1 HYD PUMP Caution Legend On.

1. TAIL SERVO switch -BACKUP; then NOR-MAL.

2.
LAND AS SOON AS PRACTICABLE.

9.27.2 #2 HYD PUMP Caution Legend On.

1. POWER ON RESET switches -Simulta-neously press, then release.

2.
LAND AS SOON AS PRACTICABLE.

9.27.3 #1 and #2 HYD PUMP Caution Legends On.
LAND AS SOON AS POSSIBLE. Restrict control movement to moderate rates.
9.27.4 #1 or #2 HYD PUMP Caution Legend On and BACK-UP PUMP ON Advisory Legend Off. Loss of both the No. 1 hydraulic pump and backup pump results in both stages of the tail-rotor servo being unpressurized. The yaw boost servo is still pressurized and the mechanical con-trol system is still intact allowing limited tail-rotor control. Because of the limited yaw control range available, a roll-on landing 40 KIAS or above is required. Loss of both the No. 2 hydraulic pump and the backup pump results in the loss of pilot-assist servos.
1. Airspeed -Adjust to a comfortable airspeed.

2. BACKUP HYD PUMP switch -ON. If BACK-UP PUMP ON advisory legend remains off:

3. FPS and BOOST switches -Off (for #2 HYD PUMP caution legend).

4.
LAND AS SOON AS POSSIBLE.

9.27.5 #1 or #2 PRI SERVO PRESS Caution Leg-end On. Illumination of #1 or #2 PRI SERVO PRESS caution legend can be caused by inadvertently placing the
　
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